As the IOT (Internet of Things) intelligence popularizes and develops, the data exchange quantity of client-side and server-side of urban rail transit ISCS (Integrated Supervisory Control System) is growing. Aiming at the problems including time-consuming data transmission and huge flow consumption caused by mass data transmission, it proposed in this paper to replace XML with JSON to serve as the data interaction format. Moreover, a LZMA algorithm–ALZMA(Advanced Lempel-Ziv-Markov chain-Algorithm) based on pretreatment is designed, enabling it to be more applicable for compression of JSON data. The experiment results showed that this transmission strategy is able to optimize 16.05% compression ratio of the transmission data of supervisory control system, which can effectively save network bandwidth and memory space.