diff --git a/sapl/comissoes/forms.py b/sapl/comissoes/forms.py
index abcce24f7..4ccc52c27 100644
--- a/sapl/comissoes/forms.py
+++ b/sapl/comissoes/forms.py
@@ -11,6 +11,33 @@ from sapl.comissoes.models import (Comissao, Composicao, DocumentoAcessorio,
                                    Participacao, Reuniao)
 from sapl.parlamentares.models import Legislatura, Mandato, Parlamentar
 
+class ComposicaoForm(forms.ModelForm):
+
+    class Meta:
+        model = Composicao
+        exclude = []
+
+    def clean(self):
+        cleaned_data = super(ComposicaoForm, self).clean()
+
+        if not self.is_valid():
+            return cleaned_data
+
+        periodo = cleaned_data['periodo']
+        comissao_pk = cleaned_data['comissao'].id
+        intersecao_periodo = Composicao.objects.filter(
+            Q(periodo__data_inicio__lte=periodo.data_fim,
+                periodo__data_fim__gte=periodo.data_fim) |
+            Q(periodo__data_inicio__gte=periodo.data_inicio,
+                periodo__data_fim__lte=periodo.data_inicio),
+            comissao_id=comissao_pk)
+
+        if intersecao_periodo:
+            raise ValidationError('O período informado '
+                                  'choca com períodos já '
+                                  'cadastrados para esta comissão')
+
+        return cleaned_data
 
 class ParticipacaoCreateForm(forms.ModelForm):
 
@@ -219,4 +246,3 @@ class DocumentoAcessorioEditForm(forms.ModelForm):
 
     def __init__(self, user=None, **kwargs):
         super(DocumentoAcessorioEditForm, self).__init__(**kwargs)
-
diff --git a/sapl/comissoes/views.py b/sapl/comissoes/views.py
index b085eb83d..2f1d2dad7 100644
--- a/sapl/comissoes/views.py
+++ b/sapl/comissoes/views.py
@@ -13,8 +13,8 @@ from sapl.base.models import AppConfig as AppsAppConfig
 from sapl.crud.base import (RP_DETAIL, RP_LIST, Crud,
                            CrudAux, MasterDetailCrud,
                            PermissionRequiredForAppCrudMixin)
-from sapl.comissoes.forms import (ComissaoForm, DocumentoAcessorioCreateForm, 
-                                  DocumentoAcessorioEditForm, ParticipacaoCreateForm, 
+from sapl.comissoes.forms import (ComissaoForm,ComposicaoForm, DocumentoAcessorioCreateForm,
+                                  DocumentoAcessorioEditForm, ParticipacaoCreateForm,
                                   ParticipacaoEditForm, ReuniaoForm)
 from sapl.materia.models import MateriaLegislativa, Tramitacao
 
@@ -81,6 +81,10 @@ class ComposicaoCrud(MasterDetailCrud):
     model_set = 'participacao_set'
     public = [RP_LIST, RP_DETAIL, ]
 
+    class CreateView(MasterDetailCrud.CreateView):
+        form_class = ComposicaoForm
+
+
     class ListView(MasterDetailCrud.ListView):
         template_name = "comissoes/composicao_list.html"
         paginate_by = None
@@ -176,7 +180,7 @@ class ReuniaoCrud(MasterDetailCrud):
             context = super().get_context_data(**kwargs)
 
             reuniao_pk = self.take_reuniao_pk()
-            
+
             if reuniao_pk == 0:
                 ultima_reuniao = list(context['reuniao_list'])
                 if len(ultima_reuniao) > 0:
@@ -235,4 +239,4 @@ class DocumentoAcessorioCrud(MasterDetailCrud):
             obj.delete()
             return HttpResponseRedirect(
                 reverse('sapl.comissoes:reuniao_detail',
-                        kwargs={'pk': obj.reuniao.pk}))
\ No newline at end of file
+                        kwargs={'pk': obj.reuniao.pk}))