diff --git a/gorequest.go b/gorequest.go
index 3f4a2e0..68dcaac 100644
--- a/gorequest.go
+++ b/gorequest.go
@@ -392,7 +392,22 @@ func (s *SuperAgent) queryStruct(content interface{}) *SuperAgent {
 		} else {
 			for k, v := range val {
 				k = strings.ToLower(k)
-				s.QueryData.Add(k, v.(string))
+				var queryVal string
+				switch t := v.(type) {
+				case string:
+					queryVal = t
+				case float64:
+					queryVal = strconv.FormatFloat(t, 'f', -1, 64)
+				case time.Time:
+					queryVal = t.Format(time.RFC3339)
+				default:
+					j, err := json.Marshal(v)
+					if err != nil {
+						continue
+					}
+					queryVal = string(j)
+				}
+				s.QueryData.Add(k, queryVal)
 			}
 		}
 	}
diff --git a/gorequest_test.go b/gorequest_test.go
index b044ce6..2cf5a74 100644
--- a/gorequest_test.go
+++ b/gorequest_test.go
@@ -1318,6 +1318,8 @@ func TestQueryFunc(t *testing.T) {
 		case case4_send_map:
 			checkQuery(t, v, "query1", "test1")
 			checkQuery(t, v, "query2", "test2")
+			checkQuery(t, v, "query3", "3.1415926")
+			checkQuery(t, v, "query4", "true")
 		}
 	}))
 	defer ts.Close()
@@ -1350,6 +1352,8 @@ func TestQueryFunc(t *testing.T) {
 		Query(map[string]interface{}{
 			"query1": "test1",
 			"query2": "test2",
+			"query3": 3.1415926,
+			"query4": true,
 		}).
 		End()
 }