Abstract: In order to improve the recovery rate of coal resources, extend the service life of mine, reduce the tunneling rate, gob-side entry retaining with flexible-formwork concrete was brought in the haulage gateway of 21404 working face by Chengjiao mine, to study the stress distribution and deformation properties of surrounding rock and the technology of surrounding rock control of gob-side entry in the case of fast forward of medium thick coal seam.The results show that: Tunnel of medium thick coal seam was kept by gob-side entry retaining technology with flexible-formwork concrete, stress concentration area located in the rear of working face within 50 meters,where deformate sharply;stress of surrounding rock is the largest at 25 meters in the rear of working face,where fall rate is fastest; outside behind working face roof 80 meters, where the roof is stable. Through taking measures of supplement support for roof and coal pillar, taking measures of temporary support for retaining roadway, improving overall strength of roadway roof, the separation and subsidence of overlying strata can be reduced.