Abstract: Based on the geological condition and foundation treatment method of the power plant project in QinZhou,this paper studied the key point of quality control during the treatment project and the possible flaw pile during construction,preventive measures and solutions are suggested.On this basis,the method of numerical simulation was used,a model of flaw pile is stalished,the plastic zone,the stress,the displacement of different parts of flaw pile are calculated,and a possible influence of the flaw is analyzed.Some useful guidance of dealing with the incidents during the construction of cast-in-place pile for engineers are given in the paper and a new thinking for mechanism of flaw pile is provided.