The design and selection of the brake is an important part during the process of bridge crane manufacturing, the position and layout of brake are related to the stable operation and crane safety. In this paper, the basic design parameter is weight of 10 tons bridge crane, the lifting mechanism for dynamic analysis and the mathematical modelsare established andthe rotational inertia of the mathematical model are evaluated. Different layout schemes of the brake are calculated and simulated, the maximum torque brakeis obtained by using Matlab software, and the optimal scheme of the brake design has been analyzed.