Channel survey covers a wide range,a long distance and spans provinces,but CORS system survey cannot span provinces.In view of this problem,this paper discusses RTK measurement,CORS system measurement and Qianxun CORS.The Qianxun FindCM measuring method has centimeter-level positioning accuracy,with full coverage,seamless connection and high overall accuracy,and can meet the requirements of large-scale,long-distance and span-provincial channel survey.It provides a new method for similar engineering survey.