Aiming at the similarities and differences among Chinese code,API code,Eurocode and Japanese code of pile foundation design,we analyze and compare the design basis theory,ultimate bearing capacity of compressive pile,ultimate bearing capacity of tensile pile and transvers bearing capacity of pile.Based on the actual projects,we calculate the ultimate bearing capacity of compressive pile,ultimate bearing capacity of tensile pile and conversion allowable bearing capacity.The results show that the safety margin of Chinese code is moderate.Thus it could be spread to overseas projects.We also put forward the attention points in actual use.