diff --git a/app/controllers/administrateurs/activate_controller.rb b/app/controllers/administrateurs/activate_controller.rb
new file mode 100644
index 000000000..396d31df6
--- /dev/null
+++ b/app/controllers/administrateurs/activate_controller.rb
@@ -0,0 +1,34 @@
+class Administrateurs::ActivateController < ApplicationController
+  layout "new_application"
+
+  def new
+    @administrateur = Administrateur.find_inactive_by_token(params[:token])
+
+    if !@administrateur
+      flash.alert = "Le lien de validation d'administrateur a expiré, contactez-nous à contact@tps.apientreprise.fr pour obtenir un nouveau lien."
+      redirect_to root_path
+    end
+  end
+
+  def create
+    administrateur = Administrateur.reset_password(
+      update_administrateur_params[:reset_password_token],
+      update_administrateur_params[:password]
+    )
+
+    if administrateur && administrateur.errors.empty?
+      sign_in(administrateur, scope: :administrateur)
+      flash.notice = "Mot de passe enregistré"
+      redirect_to admin_procedures_path
+    else
+      flash.alert = administrateur.errors.full_messages
+      redirect_to admin_activate_path(token: update_administrateur_params[:reset_password_token])
+    end
+  end
+
+  private
+
+  def update_administrateur_params
+    params.require(:administrateur).permit(:reset_password_token, :password)
+  end
+end
diff --git a/app/controllers/administrations_controller.rb b/app/controllers/administrations_controller.rb
index f182fc0a7..f600ecfd5 100644
--- a/app/controllers/administrations_controller.rb
+++ b/app/controllers/administrations_controller.rb
@@ -14,21 +14,26 @@ class AdministrationsController < ApplicationController
   end
 
   def create
-    admin = Administrateur.new create_administrateur_params
+    administrateur = current_administration.invite_admin(create_administrateur_params[:email])
 
-    if admin.save
+    if administrateur.errors.empty?
       flash.notice = "Administrateur créé"
-      AdministrationMailer.new_admin_email(admin, current_administration).deliver_now!
     else
-      flash.alert = admin.errors.full_messages
+      flash.alert = administrateur.errors.full_messages
     end
 
     redirect_to administrations_path
   end
 
+  def update
+    Administrateur.find_inactive_by_id(params[:id]).invite!
+  
+    redirect_to administrations_path
+  end
+
   private
 
   def create_administrateur_params
-    params.require(:administrateur).permit(:email, :password)
+    params.require(:administrateur).permit(:email)
   end
 end
diff --git a/app/mailers/administration_mailer.rb b/app/mailers/administration_mailer.rb
index 0bafaec32..bcc0839eb 100644
--- a/app/mailers/administration_mailer.rb
+++ b/app/mailers/administration_mailer.rb
@@ -9,6 +9,13 @@ class AdministrationMailer < ApplicationMailer
          subject: "Création d'un compte Admin TPS")
   end
 
+  def invite_admin(admin, reset_password_token)
+    @reset_password_token = reset_password_token
+    mail(to: admin.email,
+         subject: "TPS - Activez votre compte administrateur",
+         reply_to: "equipe@tps.apientreprise.fr")
+  end
+
   def dubious_procedures(procedures_and_type_de_champs)
     @procedures_and_type_de_champs = procedures_and_type_de_champs
     mail(to: 'equipe@tps.apientreprise.fr',
diff --git a/app/models/administrateur.rb b/app/models/administrateur.rb
index d23ce1cf4..18ad7e7ae 100644
--- a/app/models/administrateur.rb
+++ b/app/models/administrateur.rb
@@ -9,6 +9,16 @@ class Administrateur < ActiveRecord::Base
 
   include CredentialsSyncableConcern
 
+  scope :inactive, -> { where(active: false) }
+
+  def self.find_inactive_by_token(reset_password_token)
+    self.inactive.with_reset_password_token(reset_password_token)
+  end
+
+  def self.find_inactive_by_id(id)
+    self.inactive.find(id)
+  end
+
   def ensure_api_token
     if api_token.nil?
       self.api_token = generate_api_token
@@ -19,6 +29,46 @@ class Administrateur < ActiveRecord::Base
     update_attributes(api_token: generate_api_token)
   end
 
+  def registration_state
+    if active?
+      'Actif'
+    elsif reset_password_period_valid?
+      'En attente'
+    else
+      'Expiré'
+    end
+  end
+
+  def invite!
+    if active?
+      raise "Impossible d'inviter un utilisateur déjà actif !"
+    end
+    
+    reset_password_token = set_reset_password_token
+  
+    AdministrationMailer.invite_admin(self, reset_password_token).deliver_now!
+
+    reset_password_token
+  end
+
+  def invitation_expired?
+    !active && !reset_password_period_valid?
+  end
+
+  def self.reset_password(reset_password_token, password)
+    administrateur = self.reset_password_by_token({
+      password: password,
+      password_confirmation: password,
+      reset_password_token: reset_password_token
+    })
+
+    if administrateur && administrateur.errors.empty?
+      administrateur.update_column(:active, true)
+    end
+
+    administrateur
+  end
+
   private
 
   def generate_api_token
diff --git a/app/models/administration.rb b/app/models/administration.rb
index f19ea8226..a2e3b56fa 100644
--- a/app/models/administration.rb
+++ b/app/models/administration.rb
@@ -6,4 +6,19 @@ class Administration < ActiveRecord::Base
   def self.from_omniauth(params)
     find_by(email: params["info"]["email"])
   end
+
+  def invite_admin(email)
+    administrateur = Administrateur.new({
+      email: email,
+      active: false 
+    })
+    administrateur.password = administrateur.password_confirmation = SecureRandom.hex
+
+    if administrateur.save
+      AdministrationMailer.new_admin_email(administrateur, self).deliver_now!
+      administrateur.invite!
+    end
+
+    administrateur
+  end
 end
diff --git a/app/views/administrateurs/activate/new.html.haml b/app/views/administrateurs/activate/new.html.haml
new file mode 100644
index 000000000..256159867
--- /dev/null
+++ b/app/views/administrateurs/activate/new.html.haml
@@ -0,0 +1,8 @@
+.container
+  = form_for @administrateur, url: { controller: 'administrateurs/activate', action: :create }, html: { class: "form" } do |f|
+    %br
+    %h1
+      = @administrateur.email
+    = f.password_field :password, placeholder: 'Mot de passe'
+    = f.hidden_field :reset_password_token, value: params[:token]
+    = f.submit 'Définir le mot de passe', class: 'button large primary expand'
diff --git a/app/views/administration_mailer/invite_admin.html.haml b/app/views/administration_mailer/invite_admin.html.haml
new file mode 100644
index 000000000..6693ae419
--- /dev/null
+++ b/app/views/administration_mailer/invite_admin.html.haml
@@ -0,0 +1,16 @@
+- content_for(:title, 'Activation du compte administrateur')
+
+Bonjour,
+%br
+%br
+L'équipe TPS vous invite à activer votre compte administrateur sur TPS.
+%br
+%br
+Pour le faire, merci de cliquer sur le lien suivant :
+= link_to admin_activate_url(token: @reset_password_token), admin_activate_url(token: @reset_password_token)
+%br
+%br
+Bonne journée,
+%br
+%br
+L'équipe Téléprocédures Simplifiées
diff --git a/app/views/administrations/_list.html.haml b/app/views/administrations/_list.html.haml
index c5559f651..e17abfa15 100644
--- a/app/views/administrations/_list.html.haml
+++ b/app/views/administrations/_list.html.haml
@@ -4,6 +4,7 @@
       %thead
         %th.col-xs-4= smart_listing.sortable 'Email', :email
         %th.col-xs-4= smart_listing.sortable 'Date de dernière connexion', :last_sign_in_at
+        %th.col-xs-2 État
         %th.col-xs-2 Procédure active
         %th.col-xs-2 Dossier en cours
 
@@ -17,6 +18,11 @@
               (
               = admin.last_sign_in_at.localtime.strftime('%d/%m/%Y')
               )
+          %td
+            - if admin.invitation_expired?
+              = link_to admin.registration_state, administration_path(admin), remote: true, method: :patch
+            - else
+              = admin.registration_state
           %td
             = admin.procedures.publiees.count
           %td
diff --git a/app/views/administrations/index.html.haml b/app/views/administrations/index.html.haml
index 869242426..730a7b487 100644
--- a/app/views/administrations/index.html.haml
+++ b/app/views/administrations/index.html.haml
@@ -3,7 +3,6 @@
     = form_for @admin, url: { controller: 'administrations', action: :create } do |f|
       .form-group.form-inline.text-center
         = f.text_field :email, placeholder: :email, class: 'form-control'
-        = f.text_field :password, placeholder: :password, class: 'form-control'
 
         = f.submit 'Créer un administrateur', class: 'btn btn-success', id: 'submit_new_administrateur'
 
diff --git a/config/routes.rb b/config/routes.rb
index 6f58fe1b3..e28361914 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -55,8 +55,7 @@ Rails.application.routes.draw do
   get 'administrations/sign_in' => 'administrations/sessions#new'
   delete 'administrations/sign_out' => 'administrations/sessions#destroy'
   authenticate :administration do
-    resources :administrations, only: [:index, :create]
-    namespace :administrations do
+    resources :administrations, only: [:index, :create, :update] do
       match "/delayed_job" => DelayedJobWeb, :anchor => false, :via => [:get, :post]
     end
   end
@@ -111,6 +110,8 @@ Rails.application.routes.draw do
   end
 
   namespace :admin do
+    get 'activate' => '/administrateurs/activate#new'
+    patch 'activate' => '/administrateurs/activate#create'
     get 'sign_in' => '/administrateurs/sessions#new'
     get 'procedures/archived' => 'procedures#archived'
     get 'procedures/draft' => 'procedures#draft'
diff --git a/db/migrate/20180104150513_add_active_to_administrateurs.rb b/db/migrate/20180104150513_add_active_to_administrateurs.rb
new file mode 100644
index 000000000..5de20b1f3
--- /dev/null
+++ b/db/migrate/20180104150513_add_active_to_administrateurs.rb
@@ -0,0 +1,5 @@
+class AddActiveToAdministrateurs < ActiveRecord::Migration[5.0]
+  def change
+    add_column :administrateurs, :active, :boolean, default: false
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 08f4ec561..ab3be6bdd 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -17,12 +17,12 @@ ActiveRecord::Schema.define(version: 20180111153308) do
   enable_extension "unaccent"
 
   create_table "administrateurs", force: :cascade do |t|
-    t.string   "email",                  default: "", null: false
-    t.string   "encrypted_password",     default: "", null: false
+    t.string   "email",                  default: "",    null: false
+    t.string   "encrypted_password",     default: "",    null: false
     t.string   "reset_password_token"
     t.datetime "reset_password_sent_at"
     t.datetime "remember_created_at"
-    t.integer  "sign_in_count",          default: 0,  null: false
+    t.integer  "sign_in_count",          default: 0,     null: false
     t.datetime "current_sign_in_at"
     t.datetime "last_sign_in_at"
     t.string   "current_sign_in_ip"
@@ -30,6 +30,7 @@ ActiveRecord::Schema.define(version: 20180111153308) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string   "api_token"
+    t.boolean  "active",                 default: false
     t.index ["email"], name: "index_administrateurs_on_email", unique: true, using: :btree
     t.index ["reset_password_token"], name: "index_administrateurs_on_reset_password_token", unique: true, using: :btree
   end
diff --git a/lib/tasks/2018_01_11_add_active_state_to_administrators.rake b/lib/tasks/2018_01_11_add_active_state_to_administrators.rake
new file mode 100644
index 000000000..7de822e6c
--- /dev/null
+++ b/lib/tasks/2018_01_11_add_active_state_to_administrators.rake
@@ -0,0 +1,7 @@
+namespace :'2018_01_11_add_active_state_to_administrators' do
+  task set: :environment do
+    Administrateur.find_each do |administrateur|
+      administrateur.update_column(:active, true)
+    end
+  end
+end
diff --git a/spec/controllers/administrations_controller_spec.rb b/spec/controllers/administrations_controller_spec.rb
index 48b2ba8dc..1ce833d1b 100644
--- a/spec/controllers/administrations_controller_spec.rb
+++ b/spec/controllers/administrations_controller_spec.rb
@@ -27,7 +27,7 @@ describe AdministrationsController, type: :controller do
       sign_in administration
     end
 
-    subject { post :create, administrateur: {email: email, password: password} }
+    subject { post :create, administrateur: {email: email } }
 
     context 'when email and password are correct' do
       it 'add new administrateur in database' do
@@ -37,6 +37,8 @@ describe AdministrationsController, type: :controller do
       it 'alert new mail are send' do
         expect(AdministrationMailer).to receive(:new_admin_email).and_return(AdministrationMailer)
         expect(AdministrationMailer).to receive(:deliver_now!)
+        expect(AdministrationMailer).to receive(:invite_admin).and_return(AdministrationMailer)
+        expect(AdministrationMailer).to receive(:deliver_now!)
         subject
       end
     end
diff --git a/spec/models/administrateur_spec.rb b/spec/models/administrateur_spec.rb
index 65cc16f5f..6fb94c9fc 100644
--- a/spec/models/administrateur_spec.rb
+++ b/spec/models/administrateur_spec.rb
@@ -50,4 +50,20 @@ describe Administrateur, type: :model do
       expect(gestionnaire.valid_password?('super secret')).to be(true)
     end
   end
+
+  describe '#find_inactive_by_token' do
+    let(:administrateur) { create(:administration).invite_admin('paul@tps.fr') }
+    let(:reset_password_token) { administrateur.invite! }
+
+    it { expect(Administrateur.find_inactive_by_token(reset_password_token)).not_to be_nil }
+  end
+
+  describe '#reset_password' do
+    let(:administrateur) { create(:administration).invite_admin('paul@tps.fr') }
+    let(:reset_password_token) { administrateur.invite! }
+
+    it { expect(Administrateur.reset_password(reset_password_token, '12345678').errors).to be_empty }
+    it { expect(Administrateur.reset_password('123', '12345678').errors).not_to be_empty }
+    it { expect(Administrateur.reset_password(reset_password_token, '').errors).not_to be_empty }
+  end
 end
diff --git a/spec/models/administration_spec.rb b/spec/models/administration_spec.rb
new file mode 100644
index 000000000..9f8e0463e
--- /dev/null
+++ b/spec/models/administration_spec.rb
@@ -0,0 +1,17 @@
+require 'spec_helper'
+
+describe Administration, type: :model do
+  describe '#invite_admin' do
+    let(:administration) { create :administration }
+    let(:valid_email) { 'paul@tps.fr' }
+    subject { administration.invite_admin(valid_email) }
+
+    it {
+      expect(subject.errors).to be_empty
+      expect(subject).to be_persisted
+      expect(administration.invite_admin(valid_email).errors).not_to be_empty
+    }
+    it { expect(administration.invite_admin(nil).errors).not_to be_empty }
+    it { expect(administration.invite_admin('toto').errors).not_to be_empty }
+  end
+end