Abstract: Train-ground wireless communication was implemented by GPRS for large number of railway application service, therefor, the problem of competing GPRS resource was very prominent. This paper studied on data compression algorithms such as Run Length Coding, Huffman Coding, Arithmetic Coding, LZSS, LZW. Field experimentation was made to contrast and analyze compression effect for the data service such as train number check information, dispatching order information, dynamic monitoring information of train control.