diff --git a/pyxt/perp.py b/pyxt/perp.py
index f6d75d6..819fbcc 100644
--- a/pyxt/perp.py
+++ b/pyxt/perp.py
@@ -142,6 +142,7 @@ def get_agg_tiker(self, symbol):
         url = self.host + "/future/market" + '/v1/public/q/agg-ticker'
         code, success, error = self._fetch(method="GET", url=url, params=params, timeout=self.timeout)
         return code, success, error
+
     def get_book_ticker(self, symbol):
         """
         :return:book ticker
diff --git a/pyxt/spot.py b/pyxt/spot.py
index a4596a0..1e9dd1d 100644
--- a/pyxt/spot.py
+++ b/pyxt/spot.py
@@ -380,10 +380,13 @@ def order(self, symbol, side, type, biz_type='SPOT', time_in_force='GTC', client
             params['clientOrderId'] = client_order_id
         if price:
             params['price'] = price
-        if quantity:
-            params['quantity'] = quantity
         if quote_qty:
             params['quoteQty'] = quote_qty
+        if quantity:
+            if type == "MARKET" and side == "BUY" and quote_qty is None:
+                params['quote_qty'] = quantity * price
+            else:
+                params['quantity'] = quantity
         res = self.req_post("/v4/order", params)
         return res['result']
 
diff --git a/setup.py b/setup.py
index b1d44ee..1e96687 100644
--- a/setup.py
+++ b/setup.py
@@ -8,12 +8,12 @@
 
 setup(
     name='pyxt',
-    version='0.6.5',
+    version='0.6.6',
     description='Python3 XT.COM HTTP API Connector',
     long_description=long_description,
     long_description_content_type="text/markdown",
     url="https://github.com/kelvinxue/pyxt",
-    download_url='https://github.com/kelvinxue/pyxt/archive/refs/tags/v0.6.5.tar.gz',
+    download_url='https://github.com/kelvinxue/pyxt/archive/refs/tags/v0.6.6.tar.gz',
     license="MIT License",
     author="xt",
     author_email="xt@xt.com",