diff --git a/src/backend/commands/subscriptioncmds.c b/src/backend/commands/subscriptioncmds.c
index 082f7855b8..7f296f76a8 100644
--- a/src/backend/commands/subscriptioncmds.c
+++ b/src/backend/commands/subscriptioncmds.c
@@ -46,6 +46,8 @@
 #include "utils/syscache.h"
 
 static List *fetch_table_list(WalReceiverConn *wrconn, List *publications);
+static List *merge_subpublications(HeapTuple tuple, List *publications,
+								   bool addpub);
 
 /*
  * Common option parsing function for CREATE and ALTER SUBSCRIPTION commands.
@@ -857,6 +859,50 @@ AlterSubscription(AlterSubscriptionStmt *stmt)
 				break;
 			}
 
+		case ALTER_SUBSCRIPTION_ADD_PUBLICATION:
+		case ALTER_SUBSCRIPTION_DROP_PUBLICATION:
+			{
+				bool	copy_data = false;
+				bool	isadd = stmt->kind == ALTER_SUBSCRIPTION_ADD_PUBLICATION;
+				bool	refresh;
+				List   *publist = NIL;
+
+				publist = merge_subpublications(tup, stmt->publication, isadd);
+
+				parse_subscription_options(stmt->options,
+										   NULL,	/* no "connect" */
+										   NULL, NULL,	/* no "enabled" */
+										   NULL,	/* no "create_slot" */
+										   NULL, NULL,	/* no "slot_name" */
+										   isadd ? &copy_data : NULL, /* for drop, no "copy_data" */
+										   NULL,	/* no "synchronous_commit" */
+										   &refresh,
+										   NULL, NULL,	/* no "binary" */
+										   NULL, NULL); /* no "streaming" */
+				values[Anum_pg_subscription_subpublications - 1] =
+					publicationListToArray(publist);
+				replaces[Anum_pg_subscription_subpublications - 1] = true;
+
+				update_tuple = true;
+
+				/* Refresh if user asked us to. */
+				if (refresh)
+				{
+					if (!sub->enabled)
+						ereport(ERROR,
+								(errcode(ERRCODE_SYNTAX_ERROR),
+								 errmsg("ALTER SUBSCRIPTION with refresh is not allowed for disabled subscriptions"),
+								 errhint("Use ALTER SUBSCRIPTION ... SET PUBLICATION ... WITH (refresh = false).")));
+
+					/* Only refresh the added/dropped list of publications. */
+					sub->publications = stmt->publication;
+
+					AlterSubscription_refresh(sub, copy_data);
+				}
+
+				break;
+			}
+
 		case ALTER_SUBSCRIPTION_REFRESH:
 			{
 				bool		copy_data;
@@ -1278,3 +1324,70 @@ fetch_table_list(WalReceiverConn *wrconn, List *publications)
 
 	return tablelist;
 }
+
+/*
+ * Merge current subscription's publications and user specified publications
+ * by ADD/DROP PUBLICATIONS.
+ *
+ * If isadd == true, we will add the list of publications into current
+ * subscription's publications.  Otherwise, we will delete the list of
+ * publications from current subscription's publications.
+ */
+static List *
+merge_subpublications(HeapTuple tuple, List *newpublist, bool isadd)
+{
+	Datum	 datum;
+	bool	 isnull;
+	List	*publist = NIL;
+	ListCell	*lc;
+
+	/* Get publications */
+	datum = SysCacheGetAttr(SUBSCRIPTIONOID,
+							tuple,
+							Anum_pg_subscription_subpublications,
+							&isnull);
+	Assert(!isnull);
+	publist = textarray_to_stringlist(DatumGetArrayTypeP(datum));
+
+	foreach(lc, newpublist)
+	{
+		char		*name = strVal(lfirst(lc));
+		ListCell	*cell = NULL;
+
+		foreach(cell, publist)
+		{
+			char	*pubname = strVal(lfirst(cell));
+
+			if (strcmp(name, pubname) == 0)
+			{
+				if (isadd)
+				{
+					ereport(ERROR,
+							(errcode(ERRCODE_SYNTAX_ERROR),
+							 errmsg("publication name \"%s\" is already in subscription",
+									name)));
+				}
+				else
+				{
+					publist = list_delete_cell(publist, cell);
+					break;
+				}
+			}
+		}
+
+		if (isadd)
+			publist = lappend(publist, makeString(name));
+		else if (cell == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_SYNTAX_ERROR),
+					 errmsg("publication name \"%s\" does not exists in subscription",
+							name)));
+	}
+
+	if (publist == NIL)
+		ereport(ERROR,
+				(errcode(ERRCODE_SYNTAX_ERROR),
+				 errmsg("subscription must contain at least one publication")));
+
+	return publist;
+}
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index dd72a9fc3c..77b28fc0cf 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -9619,6 +9619,26 @@ AlterSubscriptionStmt:
 					n->options = $7;
 					$$ = (Node *)n;
 				}
+			| ALTER SUBSCRIPTION name ADD_P PUBLICATION name_list opt_definition
+				{
+					AlterSubscriptionStmt *n =
+						makeNode(AlterSubscriptionStmt);
+					n->kind = ALTER_SUBSCRIPTION_ADD_PUBLICATION;
+					n->subname = $3;
+					n->publication = $6;
+					n->options = $7;
+					$$ = (Node *)n;
+				}
+			| ALTER SUBSCRIPTION name DROP PUBLICATION name_list opt_definition
+				{
+					AlterSubscriptionStmt *n =
+						makeNode(AlterSubscriptionStmt);
+					n->kind = ALTER_SUBSCRIPTION_DROP_PUBLICATION;
+					n->subname = $3;
+					n->publication = $6;
+					n->options = $7;
+					$$ = (Node *)n;
+				}
 			| ALTER SUBSCRIPTION name ENABLE_P
 				{
 					AlterSubscriptionStmt *n =
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index 236832a2ca..8021f66595 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -3581,6 +3581,8 @@ typedef enum AlterSubscriptionType
 	ALTER_SUBSCRIPTION_CONNECTION,
 	ALTER_SUBSCRIPTION_PUBLICATION,
 	ALTER_SUBSCRIPTION_REFRESH,
+	ALTER_SUBSCRIPTION_ADD_PUBLICATION,
+	ALTER_SUBSCRIPTION_DROP_PUBLICATION,
 	ALTER_SUBSCRIPTION_ENABLED
 } AlterSubscriptionType;
 
-- 
2.30.0