A　large　number　of　Electronic　Toll　Collection(ETC)　gantry　systems　were　built　after　the　abolition　of　provincial　border　toll　stations.　In　order　to　ensure　the　information　integrity　of　ETC　gantry　equipment,　a　statistical　model　of　mileage　based　on　trajectory　data　is　proposed　to　solve　the　problem　of　Expressway　gantry　equipment　with　missing　spatial　information　and　low　information　accuracy.　In　view　of　this,　firstly,　the　section　trajectory　matrix　is　obtained　by　combining　the　trajectory　data　of　special　transportation　vehicles　and　the　transaction　data　of　ETC　gantry　system　through　data　pre-processing　and　feature　construction.　Secondly,　the　section　road　data　is　obtained　through　the　GAODE　API,　and　the　densification　process　is　performed　on　the　data.　Then,　a　section　distance　identification　model　based　on　section　trajectory　matrix　and　road　network　features　is　constructed.　Finally,　the　distance-based　spatial　information　extraction　algorithm　achieves　the　identification　of　the　target　gantry　geographic　location.　Experiment　on　119　gantry　equipment　in　Fujian　Province,　both　transaction　data　and　trajectory　data　are　from　Fujian　Expressway　Group　Co.,　Ltd.　The　extraction　results　demonstrate　that　95%　of　the　gantry　coordinate　accuracy　is　within　500　meters.　It　has　practical　application　value　and　reference　significance　to　the　informationization　of　Expressway.　©　2021　ACM.