Abstract: Abstract: Based on the laws of strata behaviors in gob-side entry retaining under the thin coal seam and hard roof, model of roadside support is built, that the roof of filling space is supported by the method of flexible support and the free subsidence of roof is reserved to avoid filling body being crushed. By comparing the scheme of the Gob-side Entry Retaining, both single props and gangue belt are used in the support of the early roof , gangue belt was used as the inner template of filling body and put the concrete mixer machine in the underground track lane, which simplify filling system greatly. As pumping concrete to the working surface directly after stirring the concrete in the 16701 working face of Quan Shang coal mine, , the practice shows that the effect of gob-side entry retaining is good, and the production needs of the next working face are basically satisfied.