diff --git a/tortoise/contrib/postgres/functions.py b/tortoise/contrib/postgres/functions.py
index 823b4aa4c..bdefae2be 100644
--- a/tortoise/contrib/postgres/functions.py
+++ b/tortoise/contrib/postgres/functions.py
@@ -1,13 +1,15 @@
 from pypika_tortoise.terms import Function, Term
 
+DEFAULT_TEXT_SEARCH_CONFIG = "pg_catalog.simple"
+
 
 class ToTsVector(Function):
     """
     to to_tsvector function
     """
 
-    def __init__(self, field: Term) -> None:
-        super().__init__("TO_TSVECTOR", field)
+    def __init__(self, field: Term, config_name: str = DEFAULT_TEXT_SEARCH_CONFIG) -> None:
+        super().__init__("TO_TSVECTOR", config_name, field)
 
 
 class ToTsQuery(Function):
@@ -15,8 +17,8 @@ class ToTsQuery(Function):
     to_tsquery function
     """
 
-    def __init__(self, field: Term) -> None:
-        super().__init__("TO_TSQUERY", field)
+    def __init__(self, field: Term, config_name: str = DEFAULT_TEXT_SEARCH_CONFIG) -> None:
+        super().__init__("TO_TSQUERY", config_name, field)
 
 
 class PlainToTsQuery(Function):
@@ -24,8 +26,8 @@ class PlainToTsQuery(Function):
     plainto_tsquery function
     """
 
-    def __init__(self, field: Term) -> None:
-        super().__init__("PLAINTO_TSQUERY", field)
+    def __init__(self, field: Term, config_name: str = DEFAULT_TEXT_SEARCH_CONFIG) -> None:
+        super().__init__("PLAINTO_TSQUERY", config_name, field)
 
 
 class Random(Function):
diff --git a/tortoise/contrib/postgres/search.py b/tortoise/contrib/postgres/search.py
index ac41d25a6..e6c4fb779 100644
--- a/tortoise/contrib/postgres/search.py
+++ b/tortoise/contrib/postgres/search.py
@@ -10,10 +10,8 @@ class Comp(Comparator):
     search = " @@ "
 
 
-class SearchCriterion(BasicCriterion):
+class SearchCriterion(BasicCriterion):  # type: ignore
     def __init__(self, field: Term, expr: Union[Term, Function]) -> None:
-        if isinstance(expr, Function):
-            _expr = expr
-        else:
-            _expr = ToTsQuery(expr)
-        super().__init__(Comp.search, ToTsVector(field), _expr)
+        if not isinstance(expr, Function):
+            expr = ToTsQuery(expr)
+        super().__init__(Comp.search, ToTsVector(config_name=expr.args[0].value, field=field), expr)