Environment　effect　due　to　traffic　transportation　is　paid　more　and　more　attention　nowadays.　A　site　experiment　is　one　primary　approach　to　this　problem,　but　because　of　mass　background　vibration,　the　testing　data　can　not　represent　the　characteristic　of　vibration　sources　and　promulgation.　In　order　to　obtain　ideal　data,　two　methods　to　remove　background　vibration　were　presented　here,　one　was　Fourier　amplitude　revised　method,　the　other　was　acceleration　vibration　level　revised　method.　The　two　methods　were　tested,　the　result　showed　that　the　two　methods　were　effective.　Basic　principles　to　banish　background　vibration　were　discussed　in　the　end.