diff --git a/backend-python/utils/rwkv.py b/backend-python/utils/rwkv.py
index b8065b9..97dbc9e 100644
--- a/backend-python/utils/rwkv.py
+++ b/backend-python/utils/rwkv.py
@@ -3,7 +3,7 @@ import pathlib
 import copy
 from typing import Dict, List
 from fastapi import HTTPException
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from rwkv_pip.utils import PIPELINE
 from routes import state_cache
 
@@ -182,23 +182,23 @@ The following is a coherent verbose detailed conversation between a girl named {
 
 
 class ModelConfigBody(BaseModel):
-    max_tokens: int = None
-    temperature: float = None
-    top_p: float = None
-    presence_penalty: float = None
-    frequency_penalty: float = None
+    max_tokens: int = Field(default=None, gt=0, le=102400)
+    temperature: float = Field(default=None, ge=0, le=2)
+    top_p: float = Field(default=None, ge=0, le=1)
+    presence_penalty: float = Field(default=None, ge=-2, le=2)
+    frequency_penalty: float = Field(default=None, ge=-2, le=2)
 
 
 def set_rwkv_config(model: RWKV, body: ModelConfigBody):
-    if body.max_tokens:
+    if body.max_tokens is not None:
         model.max_tokens_per_generation = body.max_tokens
-    if body.temperature:
+    if body.temperature is not None:
         model.temperature = body.temperature
-    if body.top_p:
+    if body.top_p is not None:
         model.top_p = body.top_p
-    if body.presence_penalty:
+    if body.presence_penalty is not None:
         model.penalty_alpha_presence = body.presence_penalty
-    if body.frequency_penalty:
+    if body.frequency_penalty is not None:
         model.penalty_alpha_frequency = body.frequency_penalty