diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLFastBuilder.cs b/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLFastBuilder.cs
index d453254a8..8f7871cc6 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLFastBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLFastBuilder.cs
@@ -99,6 +99,10 @@ namespace SqlSugar
                     {
                         result.Type = NpgsqlDbType.Array | NpgsqlDbType.Bigint;
                     }
+                    else if (key == "_float8")
+                    {
+                        result.Type = NpgsqlDbType.Array | NpgsqlDbType.Double;
+                    }
                     else
                     {
                         var type = PgSqlType[key.Substring(1)];