Abstract: The vertical static load test is adopted to investigate 6 super-long bored piles in loess,in which the variation of axis force in piles is tested by sliding micrometer. Hence, the bearing capacity behavior , load transfer mechanism , the lateral friction and end bearing are researched in this paper. According to the test results, the Q—S curves of super-long bored piles are slowly varying.The boring method, pile length and soil around pile are all important to the load transfer mechanism and the action of lateral friction.For the natural structure of loess, the tested results are far larger than the standard values in code. As the result, the bearing capacity of super-long bored piles in loess is very well, while lateral friction and end bearing can not display simultaneously. It is necessary to adopt different coefficients of lateral friction and end bearing in practice.