diff --git a/src/azure-cli-core/azure/cli/core/telemetry.py b/src/azure-cli-core/azure/cli/core/telemetry.py
index cc10885e88b..852c6468b30 100644
--- a/src/azure-cli-core/azure/cli/core/telemetry.py
+++ b/src/azure-cli-core/azure/cli/core/telemetry.py
@@ -104,7 +104,7 @@ def _get_base_properties(self):
             'Reserved.ChannelUsed': 'AI',
             'Reserved.EventId': str(uuid.uuid4()),
             'Reserved.SequenceNumber': 1,
-            'Reserved.SessionId': str(uuid.uuid4()),
+            'Reserved.SessionId': _get_session_id(),
             'Reserved.TimeSinceSessionStart': 0,
 
             'Reserved.DataModel.Source': 'DataModelAPI',
@@ -407,6 +407,33 @@ def _get_installation_id():
     return _get_profile().get_installation_id()
 
 
+@decorators.suppress_all_exceptions(fallback_return="")
+def _get_session_id():
+    # As a workaround to get the terminal info as SessionId, this function may not be accurate.
+
+    def get_hash_result(content):
+        import hashlib
+
+        hasher = hashlib.sha256()
+        hasher.update(content.encode('utf-8'))
+        return hasher.hexdigest()
+
+    # Usually, more than one layer of sub-process will be started when excuting a CLI command. While, the create time
+    # of these sub-processes will be very close, usually in several milliseconds. We use 1 second as the threshold here.
+    # When the difference of create time between current process and its parent process is larger than the threshold,
+    # the parent process will be viewed as the terminal process.
+    import psutil
+    time_threshold = 1
+    process = psutil.Process()
+    while process and process.ppid() and process.pid != process.ppid():
+        parent_process = process.parent()
+        if parent_process and process.create_time() - parent_process.create_time() > time_threshold:
+            content = '{}{}{}'.format(_get_installation_id(), parent_process.create_time(), parent_process.pid)
+            return get_hash_result(content)
+        process = parent_process
+    return ""
+
+
 @decorators.call_once
 @decorators.suppress_all_exceptions(fallback_return=None)
 def _get_profile():
diff --git a/src/azure-cli/requirements.py3.Darwin.txt b/src/azure-cli/requirements.py3.Darwin.txt
index 90ff777b923..02d9b951e14 100644
--- a/src/azure-cli/requirements.py3.Darwin.txt
+++ b/src/azure-cli/requirements.py3.Darwin.txt
@@ -108,6 +108,7 @@ oauthlib==3.0.1
 paramiko==2.6.0
 pbr==5.3.1
 portalocker==1.4.0
+psutil==5.7.2
 pycparser==2.19
 PyJWT==1.7.1
 PyNaCl==1.3.0
diff --git a/src/azure-cli/requirements.py3.Linux.txt b/src/azure-cli/requirements.py3.Linux.txt
index 90ff777b923..02d9b951e14 100644
--- a/src/azure-cli/requirements.py3.Linux.txt
+++ b/src/azure-cli/requirements.py3.Linux.txt
@@ -108,6 +108,7 @@ oauthlib==3.0.1
 paramiko==2.6.0
 pbr==5.3.1
 portalocker==1.4.0
+psutil==5.7.2
 pycparser==2.19
 PyJWT==1.7.1
 PyNaCl==1.3.0
diff --git a/src/azure-cli/requirements.py3.windows.txt b/src/azure-cli/requirements.py3.windows.txt
index 8bd62e5f3c7..6294a4eb3f7 100644
--- a/src/azure-cli/requirements.py3.windows.txt
+++ b/src/azure-cli/requirements.py3.windows.txt
@@ -106,6 +106,7 @@ oauthlib==3.0.1
 paramiko==2.6.0
 pbr==5.3.1
 portalocker==1.2.1
+psutil==5.7.2
 pycparser==2.19
 PyJWT==1.7.1
 PyNaCl==1.3.0
diff --git a/src/azure-cli/setup.py b/src/azure-cli/setup.py
index 7636fc411e0..ea60cbc82ff 100644
--- a/src/azure-cli/setup.py
+++ b/src/azure-cli/setup.py
@@ -139,6 +139,10 @@
     'jsondiff==1.2.0'
 ]
 
+# dependencies for specific OSes
+if not sys.platform.startswith('cygwin'):
+    DEPENDENCIES.append('psutil~=5.7')
+
 TESTS_REQUIRE = [
     'mock~=4.0'
 ]