At first, a design and construction flow of pile foundation in the present knowledge and experience situation is presented to indicate the state of the art of this field in this Technical note. Then, issues of the design method for the bearing capacity of open-ended piles were presented. To overcome these issue, mechanism of the development of the bearing resistance of open-ended piles were observed. Furthermore, currently developed pile loading methods were surveyed and applicable pile loading methods for estimating the bearing capacity of a pile and construction control used in port facilities were summarized. Finally new method for estimating pile bearing capacity was presented based on the above research works and appendices A and B in this note.
　Main conclusions of this research are as follows;
　1)It is inadequate to apply the existing bearing capacity estimation method used in Japanese standards utilizing SPT-N values for the piles with more than 50 m embedded length.
　2)End bearing capacity of open-ended piles were consisted of both pile annulus and inner friction between pile and soil inside the pile from pile tip to 2 times of pile diameter.
　3)Because of the simplicity of dynamic pile loading tests which are getting popular, they can be used for the estimation of bearing capacity of piles and pile construction control.
　4)New design and construction control method with utilizing the pile loading tests are porposed.