Supported catalysts were prepared using in-situ method by Keggin type phosphotungstic acid supported on SBA-15,and were characterized through XRD,FTIR,NH3-TPD,N2 adsorptiondesorption methods.The supported catalyst PW_(12)-SBA-15 was used in the catalytic synthesis of tributyl citrate(TBC),and the influencing factors were analyzed.The results show that the basic structure of SBA-15 and PW_(12) are maintained,and the catalysts has good acid centers.The optimum conditions are the loading of phosphotungstic aci...