Abstract: By the comparison of 2 project cases at Songhuajiang riverside and in the sub-center of Beijing, the exploration is made on cast-in-place piles construction by auger bored press concrete post-inserted steel reinforcement cage under the combined condition of liquefied formation and thick sand layer, the application scope is summarized to be within 20m and the key technical measures of construction under similar geological conditions are introduced, which has been applied in the project with success and can be reference for similar engineering.