At　present,　there　are　almost　no　reports　on　the　field　measurement　of　the　prestressed　high-strength　concrete(PHC)　pipe　pile　subjected　to　negative　skin　friction.　To　reveal　the　characteristics　of　negative　skin　friction　on　PHC　pile　piles,　the　measures　of　installation　of　and　protection　to　the　fiber　Bragg　grating　sensors(FBG)　on　the　PHC　pipe　piles　were　studied　and　the　strains　of　4　piles　of　a　building　foundation　subjected　to　negative　skin　frictions　induced　by　the　recent　soil　filling　were　monitored　for　21　months.　The　axial　forces　of　the　piles　were　deduced　and　their　variation　curves　were　plotted.　The　distribution　and　variation　features　of　the　axial　forces　of　the　piles　under　the　loads　from　the　superstructure　and　the　negative　skin　frictions　were　analyzed.　The　measured　values　of　the　drag　loads　induced　by　the　negative　skin　frictions　on　the　PHC　piles　were　notably　greater　than　the　values　calculated　according　to　the　current　Chinese　code-Technical　Code　for　Building　Pile　Foundation(JGJ94-2008),　indicating　that　the　current　theoretical　method　still　needs　to　be　improved.　In　the　strata　with　non-uniformly　distributed　soft　and　stiff　layers,　the　negative　skin　and　positive　skin　frictions　might　occur　alternately　and　how　to　consider　this　kind　of　circumstance　in　theoretical　calculations　is　worth　studying.　The　quality　of　and　avoiding　the　construction　damage　to　the　asphalt　coating　are　the　key　to　ensure　the　effective　reduction　of　the　negative　skin　friction.　©　2017,　Science　Press.　All　right　reserved.