Abstract: In order to solve the problem of unstable support of broken roof in coal roadway, based on the theory of “anchored cluster structure”, we designed the safety coefficient m of the group system, the minimum thicknessh of the generated block beam, the thickness h of the generated beam with different supporting schemes and other parameters. Through the optimization calculation of MATLAB software, we obtained the design scheme of the optimal bolt parameters. The calculated scheme of “anchored cluster structure” has been reduced in the field practice, which indicates that the parameters of the bolt are reasonable.