diff --git a/requirements.txt b/requirements.txt
index 3334465..a9ab10b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 Flask==2.0.1
 Flask-Login==0.5.0
 mysql-connector-python==8.0.26
-python-dotenv==0.19.0
\ No newline at end of file
+python-dotenv==0.19.0
+cryptography==2.0
\ No newline at end of file
diff --git a/templates/create_ca.html b/templates/create_ca.html
index 153df9b..7cc35cc 100644
--- a/templates/create_ca.html
+++ b/templates/create_ca.html
@@ -60,4 +60,15 @@
                 </div>
                 <div class="col-md-6">
                     <label for="days_valid" class="form-label">有效期(天)</label>
-                    <input type="number" class="form-control" id="days_valid" name="days_valid" value="3650"
\ No newline at end of file
+                    <input type="number" class="form-control" id="days_valid" name="days_valid" value="3650" required>
+                </div>
+            </div>
+
+            <div class="d-grid gap-2 d-md-flex justify-content-md-end">
+                <a href="{{ url_for('ca_list') }}" class="btn btn-secondary me-md-2">取消</a>
+                <button type="submit" class="btn btn-primary">创建CA机构</button>
+            </div>
+        </form>
+    </div>
+</div>
+{% endblock %}
\ No newline at end of file