In soft foundation treatment by blasting silt extrusion,there are many external factors affecting its implementation effect and the external environments of different construction areas are quite different,so it is difficult to apply the previous construction experience directly.For achieving the best effect of blasting silt squeezing,combining with the reclamation project of Dalian Airborne Industrial Park,we study the influence of external factors such as working environment,stone filling and charge distribution on the effect of blasting silt squeezing by means of field comparative test.The test results show that the effect of silt extrusion is better when using better graded and smaller-sized stones in blasting construction at high tide level.At the same time,the effect of silt extrusion by blasting can be fully guaranteed by the method of pressing charge distribution,which is easier to ensure the quality of charge distribution than that by vibration charge distribution.By formulating a reasonable construction plan,the blasting silt squeezing construction is successfully completed,and the quality of the cofferdam meets the design requirements.