Abstract: Based on the bored pile construction in the large equipment assembly workshop project of the Shenhua coal gasification item,aiming at the character of easy collapse and strong water-permeability of fine silt sand layer,which induces bore wall bad stability,this article illustrates the successful bored pile construction technique by some key technique measures such as controlling slurry denseness and boring speed in the layer totally consisted of fine silt sand,which ensure the quality of the bored pile and make preferable effects,and which can also be referred for similar pile foundation engineering in the future.