Abstract：Traditional analog topographic map plotting can not meet the need of practice for digitalized map.This method is being replaced by method of digital mapping with the development of surveying and mapping instruments, theories and techniques.Using RTK can collect coordinates of ground points flexibly, which provides a practical method for digitalized map.On the basis of analyzing limitation of total station digital mapping, The paper discusses operating principle and basic constitution of RTK technique.The feasibility of surveying and mapping applying RTK technique considering the actual mountainous area is illustrated, field work and indoor work are done accordingly.Moreover, data formation transformation between RTK data and CASS data is also expatiated.

Keyword：RTK;CASS-5.1;Large scale topographic map;