This paper analyzises the relationship between the compressive strength material ratio and the age of concrete respectively,and discusses the bearing capacity impected by the material properties of the pile through the experiments on materials mechanical properties of CFG pile composed of Grade Ⅲa large dosage of fly ash concrete.The results show that the efficiency of the compressive strength increases with the gel decreasing,and the compressive strength could still meet the design requirements when the replacement rate of fly ash cement is more than 40%;with the increasement of the age,all type and some certain cementation efficiency of the specimen compressive strength are improved significantly.