Abstract: With the continuous increase in the depth of coal resources development, the original stress field of the stratum shows a significant strengthening trend, and the enlarged design of the size of the traditional roadway structure leads to a significant reduction in the recoverable reserves, in which the technology of retaining the roadway along the goaf has become an important research direction in the field of deep mining by virtue of its resource-saving advantages and engineering safety features.Aiming at the time-dependent large deformation of surrounding rock triggered by repeated mining disturbances in the reused roadway, we comprehensively applied the numerical simulation platform of three-dimensional finite-difference method and the rock mechanics theory, and taking the Jingfang Coal Mine 3-607 working face as the engineering background, systematically revealed the dynamic evolution mechanism of the stress field of surrounding rock in the process of alternating mining of double working faces.The results show that compared with the initial mining, the intensity of surrounding rock disturbance triggered by the secondary mining process is significantly enhanced, with an increase of 37%～52%;the engineering necessity of optimization of the support system is verified by constructing a multi-parameter comparative test, and the value of the width of the flexible mold wall for the gob-side entry retaining of the flexible mold bag structure is determined as 1.5 based on the multi-objective decision-making method.