The effective length of pile foundation is the main control parameter when checking the buckling capacity of pile for high pile beam jetty. The effective length calculation method of pile under ideal constraints is provided in Chinese and foreign codes，but it cannot fully reflect the actual constraints on jetty top，and the boundary type of wharf integral pile foundation analysis is not defined. We introduce the method to calculate pile effective length using buckling critical load by finite element method，which can reflect the accurate actual constraints. We propose the design idea of partial analysis and integral analysis of wharf pile，and obtain the corresponding law. The results show that for pile partial analysis，the top boundary of end pile bent 1~3 can be considered as articulated，and that of the other racks can be considered as fixed. For the integral analysis of wharf structure，the top boundary of the integral pile foundation is a smooth constraint. For the integral analysis of wharf structure，the top boundary of the overall pile foundation can be considered as smooth constraint when pile bent are all more than 2. The top transverse boundary can be considered as smooth constraint when single pile bent is with more than 2 piles. The pile arrangement，raking slope and so on are varietal in actual engineering. This method can be used for specific analysis.