The construction of pile foundation is the key to the construction of high pile supported dolphin structure,especially the construction of bored pile under complicated geological conditions in unshielded sea area due to many influencing factors and high technical difficulty.Based on the actual construction situation of bored pile for wharf approach bridge of a power plant in Pakistan,the construction conditions and key construction techniques are analyzed.The analysis results show that:for bored pile construction without overburden geology,steel casing construction is suggested to adopt the construction technology of combination of drilling and re-drilling;in order to ensure the perpendicularity of pile foundation,the corresponding piling guide frame should be designed according to the specific pile foundation conditions;in the process of underwater bored pile construction,if abnormal questions occur,construction should be suspended immediately and specific solutions needed to be put forward before continuing construction.