diff --git a/UPDATING.md b/UPDATING.md
index 5b28a5efc35b6..baa87a449a7f5 100644
--- a/UPDATING.md
+++ b/UPDATING.md
@@ -61,6 +61,11 @@ https://developers.google.com/style/inclusive-documentation
 
 -->
 
+
+### Use NULL as default value for dag.description
+
+Now use NULL as default value for dag.description in dag table
+
 ### Assigning task to a DAG using bitwise shift (bit-shift) operators are no longer supported
 
 Previously, you could assign a task to a DAG as follows:
diff --git a/airflow/models/dag.py b/airflow/models/dag.py
index f9f9bec408222..a5642992a124d 100644
--- a/airflow/models/dag.py
+++ b/airflow/models/dag.py
@@ -210,7 +210,7 @@ class DAG(BaseDag, LoggingMixin):
     def __init__(
         self,
         dag_id: str,
-        description: str = '',
+        description: Optional[str] = None,
         schedule_interval: Optional[ScheduleInterval] = timedelta(days=1),
         start_date: Optional[datetime] = None,
         end_date: Optional[datetime] = None,
diff --git a/airflow/www/templates/airflow/dag.html b/airflow/www/templates/airflow/dag.html
index 893d3b0e8fec3..ded41def4c1f4 100644
--- a/airflow/www/templates/airflow/dag.html
+++ b/airflow/www/templates/airflow/dag.html
@@ -33,7 +33,8 @@ <h3 class="pull-left">
         <span style='color:#AAA;'>SUBDAG: </span> <span> {{ dag.dag_id }}</span>
       {% else %}
         <input id="pause_resume" dag_id="{{ dag.dag_id }}" type="checkbox" {{ "checked" if not dag.is_paused else "" }} data-toggle="toggle" data-size="mini" method="post">
-        <span style='color:#AAA;'>DAG: </span> <span> {{ dag.dag_id }}</span> <small class="text-muted"> {{ dag.description }} </small>
+        <span style='color:#AAA;'>DAG: </span> <span> {{ dag.dag_id }}</span>
+        <small class="text-muted"> {{ dag.description[0:150] + '...' if dag.description and dag.description|length > 150 else dag.description|default('', true) }} </small>
       {% endif %}
       {% if root %}
         <span style='color:#AAA;'>ROOT: </span> <span> {{ root }}</span>
diff --git a/airflow/www/templates/airflow/dags.html b/airflow/www/templates/airflow/dags.html
index cd6287ee61ad4..4d729538b0a69 100644
--- a/airflow/www/templates/airflow/dags.html
+++ b/airflow/www/templates/airflow/dags.html
@@ -99,7 +99,8 @@ <h2>DAGs</h2>
                 <!-- Column 3: Name -->
                 <td>
                     <span>
-                      <a href="{{ url_for('Airflow.'+ dag.default_view, dag_id=dag.dag_id) }}" title="{{ dag.description[0:80] + '...' if dag.description|length > 80 else dag.description }}">
+                      <a href="{{ url_for('Airflow.'+ dag.default_view, dag_id=dag.dag_id) }}"
+                         title="{{ dag.description[0:80] + '...' if dag.description and dag.description|length > 80 else dag.description|default('', true) }}">
                           {{ dag.dag_id }}
                       </a>
                     </span>