Abstract: With a focus on the sand flow in the excavation process in mid-stream sand,starting with the hydrological and geological conditions,it analyses in theory the causes of sand flow,and sums up four effective control measures to deal with flow of sand:an emergency backfill,a complex rotary sealing spray piles,cracks jet grouting and concrete network.

Key words: excavation engineering； quicksand； the causes of sand flow； control sand flow；