The Global Positioning System (GPS) Real Time Kinematic (RTK) technique has already been used extensively in surveying engineering. The drawbacks of RTK technique are many factors such as signal obstruction of satellite and radio. Therefore the method of RTK technique is inconveniently to use in metropolitan district area. In this study, the positioning precision of the method of RTK will be discussed and analyzed in different ratio of obstacle in open sky and the feasibility of GPS RTK technique in the chosen test data-Taichung city. The coalition of RTK and total station will also be discussed in this study.