Abstract：With the popularization of fourth generation(4G) mobile communication technology and the four/eightcore mobile phones, the data transmission capacity on the wireless network and the performance of mobile terminal are substantially improved. Mobile users are widely involved in making geographic information acquisition, upload and download. However, the requirements of data transmission will reach an unprecedented level, and are incompatible with the limited bandwidth. To meet with the new requirements of the higher compression rate and precision tolerance for spatial data, a vector data compression method is designed independently. Removing redundant points, parallel moving coordinate axis and data type conversion are used as three steps in the method to realize double compression. The tests reveal that the comprehensive compression rate of this method is close to 70%. It has effectively reduced the data transmission pressure in the wireless network, and has saved the memory space of mobile terminal.