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-A-LZMA(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.