diff --git a/apisix/plugins/grpc-transcode/util.lua b/apisix/plugins/grpc-transcode/util.lua
index 83d89abaf2a0..d705a1ed7126 100644
--- a/apisix/plugins/grpc-transcode/util.lua
+++ b/apisix/plugins/grpc-transcode/util.lua
@@ -51,7 +51,7 @@ local function get_from_request(name, kind)
     local request_table
     if ngx.req.get_method() == "POST" then
         if string.find(ngx.req.get_headers()["Content-Type"] or "",
-                       "application/json", true) then
+                       "application/json", 1, true) then
             request_table = json.decode(ngx.req.get_body_data())
         else
             request_table = ngx.req.get_post_args()
diff --git a/t/plugin/grpc-transcode.t b/t/plugin/grpc-transcode.t
index 92a760cf8529..9baca8207595 100644
--- a/t/plugin/grpc-transcode.t
+++ b/t/plugin/grpc-transcode.t
@@ -81,7 +81,7 @@ passed
             local code, body = t('/apisix/admin/routes/1',
                 ngx.HTTP_PUT,
                 [[{
-                    "methods": ["GET"],
+                    "methods": ["GET", "POST"],
                     "uri": "/grpctest",
                     "service_protocol": "grpc",
                     "plugins": {
@@ -125,7 +125,31 @@ qr/\{"message":"Hello world"\}/
 
 
 
-=== TEST 4: wrong service protocol
+=== TEST 4: hit route by post
+--- request
+POST /grpctest
+name=world
+--- response_body eval
+qr/\{"message":"Hello world"\}/
+--- no_error_log
+[error]
+
+
+
+=== TEST 5: hit route by post json
+--- request
+POST /grpctest
+{"name": "world"}
+--- more_headers
+Content-Type: application/json
+--- response_body eval
+qr/\{"message":"Hello world"\}/
+--- no_error_log
+[error]
+
+
+
+=== TEST 6: wrong service protocol
 --- config
     location /t {
         content_by_lua_block {
@@ -166,7 +190,7 @@ GET /t
 
 
 
-=== TEST 5: wrong upstream address
+=== TEST 7: wrong upstream address
 --- config
     location /t {
         content_by_lua_block {
@@ -208,7 +232,7 @@ passed
 
 
 
-=== TEST 6: hit route (Connection refused)
+=== TEST 8: hit route (Connection refused)
 --- request
 GET /grpctest
 --- response_body eval
@@ -219,7 +243,7 @@ Connection refused) while connecting to upstream
 
 
 
-=== TEST 7: update proto(id: 1)
+=== TEST 9: update proto(id: 1)
 --- config
     location /t {
         content_by_lua_block {
@@ -266,7 +290,7 @@ passed
 
 
 
-=== TEST 8: set routes(id: 2)
+=== TEST 10: set routes(id: 2)
 --- config
     location /t {
         content_by_lua_block {
@@ -309,7 +333,7 @@ passed
 
 
 
-=== TEST 9: hit route
+=== TEST 11: hit route
 --- request
 GET /grpc_plus?a=1&b=2
 --- response_body eval
@@ -319,7 +343,7 @@ qr/\{"result":3\}/
 
 
 
-=== TEST 10: hit route
+=== TEST 12: hit route
 --- request
 GET /grpc_plus?a=1&b=2251799813685260
 --- response_body eval
@@ -329,7 +353,7 @@ qr/\{"result":"#2251799813685261"\}/
 
 
 
-=== TEST 11: set route3 deadline nodelay
+=== TEST 13: set route3 deadline nodelay
 --- config
     location /t {
         content_by_lua_block {
@@ -371,7 +395,7 @@ passed
 
 
 
-=== TEST 12: hit route
+=== TEST 14: hit route
 --- request
 GET /grpc_deadline?name=apisix
 --- response_body eval
@@ -381,7 +405,7 @@ qr/\{"message":"Hello apisix"\}/
 
 
 
-=== TEST 13: set route4 deadline delay
+=== TEST 15: set route4 deadline delay
 --- config
     location /t {
         content_by_lua_block {
@@ -423,14 +447,14 @@ passed
 
 
 
-=== TEST 14: hit route
+=== TEST 16: hit route
 --- request
 GET /grpc_delay?name=apisix
 --- error_code: 504
 
 
 
-=== TEST 15: set routes: missing method
+=== TEST 17: set routes: missing method
 --- config
     location /t {
         content_by_lua_block {