diff --git a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
index bbc2d5e9..382de62f 100644
--- a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
@@ -182,8 +182,8 @@ t.typname,
 case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.attlen end len,
 case when t.typelem > 0 and t.typinput::varchar = 'array_in' then t2.typname else t.typname end,
 case when a.attnotnull then '0' else '1' end as is_nullable,
-coalesce((select 1 from pg_sequences where lower(sequencename) = lower({0} || '_' || {1} || '_' || a.attname || '_sequence_name') limit 1),0) is_identity,
 --e.adsrc,
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
 a.attndims,
 d.description as comment
 from pg_class c
@@ -219,7 +219,7 @@ where ns.nspname = {0} and c.relname = {1}", tboldname ?? tbname);
                         sqlType = string.Concat(sqlType),
                         max_length = long.Parse(string.Concat(a[2])),
                         is_nullable = string.Concat(a[4]) == "1",
-                        is_identity = string.Concat(a[5]) == "1", //string.Concat(a[5]).StartsWith(@"nextval('") && string.Concat(a[5]).EndsWith(@"'::regclass)"),
+                        is_identity = string.Concat(a[5]).StartsWith(@"nextval('") && string.Concat(a[5]).EndsWith(@"'::regclass)"),
                         attndims,
                         comment = string.Concat(a[7])
                     };
diff --git a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs
index 913ae1c3..db21a33f 100644
--- a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs
@@ -209,8 +209,8 @@ t.typname,
 case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.attlen end len,
 case when t.typelem = 0 then t.typname else t2.typname end,
 case when a.attnotnull then 0 else 1 end as is_nullable,
-coalesce((select 1 from pg_sequences where lower(sequencename) = lower({0} || '_' || {1} || '_' || a.attname || '_sequence_name') limit 1),0) is_identity,
---e.adsrc as is_identity,
+--e.adsrc as is_identity, pg12以下
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
 d.description as comment,
 a.attndims,
 case when t.typelem = 0 then t.typtype else t2.typtype end,
@@ -236,7 +236,7 @@ where {loc8.ToString().Replace("a.table_name", "ns.nspname || '.' || c.relname")
                     var max_length = int.Parse(string.Concat(row[3]));
                     var sqlType = string.Concat(row[4]);
                     var is_nullable = string.Concat(row[5]) == "1";
-                    var is_identity = string.Concat(row[6]) == "1"; //string.Concat(row[6]).StartsWith(@"nextval('") && string.Concat(row[6]).EndsWith(@"'::regclass)");
+                    var is_identity = string.Concat(row[6]).StartsWith(@"nextval('") && string.Concat(row[6]).EndsWith(@"'::regclass)");
                     var comment = string.Concat(row[7]);
                     int attndims = int.Parse(string.Concat(row[8]));
                     string typtype = string.Concat(row[9]);
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
index e5a65693..ba8f6671 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
@@ -217,8 +217,8 @@ t.typname,
 case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.attlen end len,
 case when t.typelem > 0 and t.typinput::varchar = 'array_in' then t2.typname else t.typname end,
 case when a.attnotnull then '0' else '1' end as is_nullable,
-coalesce((select 1 from pg_sequences where lower(sequencename) = lower({0} || '_' || {1} || '_' || a.attname || '_sequence_name') limit 1),0) is_identity,
 --e.adsrc,
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
 a.attndims,
 d.description as comment
 from pg_class c
@@ -254,7 +254,7 @@ where ns.nspname = {0} and c.relname = {1}", tboldname ?? tbname);
                         sqlType = string.Concat(sqlType),
                         max_length = long.Parse(string.Concat(a[2])),
                         is_nullable = string.Concat(a[4]) == "1",
-                        is_identity = string.Concat(a[5]) == "1", //string.Concat(a[5]).StartsWith(@"nextval('") && string.Concat(a[5]).EndsWith(@"'::regclass)"),
+                        is_identity = string.Concat(a[5]).StartsWith(@"nextval('") && string.Concat(a[5]).EndsWith(@"'::regclass)"),
                         attndims,
                         comment = string.Concat(a[7])
                     };
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs
index eb586c98..29c93a20 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs
@@ -319,8 +319,8 @@ t.typname,
 case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.attlen end len,
 case when t.typelem = 0 then t.typname else t2.typname end,
 case when a.attnotnull then 0 else 1 end as is_nullable,
-coalesce((select 1 from pg_sequences where lower(sequencename) = lower({0} || '_' || {1} || '_' || a.attname || '_sequence_name') limit 1),0) is_identity,
---e.adsrc as is_identity,
+--e.adsrc as is_identity, pg12以下
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
 d.description as comment,
 a.attndims,
 case when t.typelem = 0 then t.typtype else t2.typtype end,
@@ -346,7 +346,7 @@ where {loc8.ToString().Replace("a.table_name", "ns.nspname || '.' || c.relname")
                     var max_length = int.Parse(string.Concat(row[3]));
                     var sqlType = string.Concat(row[4]);
                     var is_nullable = string.Concat(row[5]) == "1";
-                    var is_identity = string.Concat(row[6]) == "1"; //string.Concat(row[6]).StartsWith(@"nextval('") && string.Concat(row[6]).EndsWith(@"'::regclass)");
+                    var is_identity = string.Concat(row[6]).StartsWith(@"nextval('") && string.Concat(row[6]).EndsWith(@"'::regclass)");
                     var comment = string.Concat(row[7]);
                     int attndims = int.Parse(string.Concat(row[8]));
                     string typtype = string.Concat(row[9]);