Large diameter cast-in-situ bored pile is widely used in high piled wharf,long distance approach trestle and some other port engineering projects.The calculation of vertical bearing capacity of large diameter cast-in-situ bored pile is not only related to the safety of the structure,but also related to project overall investment.After the comparative analysis of vertical bearing capacity design of large diameter cast-in-situ bored pile between Chinese and British codes,we try to seek rational optimization of pile length under the premise of safe and reliable of structure, finally recheck the vertical bearing capacity of pile through the static test results. The research results can provide a certain theoretical basis for the design of large diameter cast-in-situ bored pile in port engineering projects.