Measuring　the　earth　pressure　with　rigid　soil　pressure　cell　(SPC)　is　a　common　test　method　in　geotechnical　tests.　However,　the　traditional　rigid　soil　pressure　cell　is　not　suitable　for　measuring　the　earth　pressures　on　curved　surface　such　as　piles　or　buried　pipelines　because　of　its　limitations　such　as　diaphragm　subsidence,　＇embedding＇　effect,　incomplete　fitting　of　measuring　surface　and　large　buried　space.　The　measurement　circuit　and　calibration　devices　are　designed　for　the　characteristics　of　the　thin　film　pressure　sensor.　The　calibration　characteristics　are　analyzed,　and　the　influences　of　deflection　on　the　measurement　of　the　film　pressure　sensor　are　preliminarily　investigated.　Finally,　the　capabilities　of　the　traditional　rigid　soil　pressure　cell　and　the　thin　film　pressure　sensor　to　measure　the　soil　pressures　on　curved　surface　are　compared　and　analyzed　through　experiments.　The　results　show　that　the　thin　film　pressure　sensor　can　effectively　avoid　the　＇embedding＇　effect,　reduce　the　measurement　error,　and　is　easy　to　install.　©　2020,　Editorial　Office　of　Chinese　Journal　of　Geotechnical　Engineering.　All　right　reserved.