According to the specific parameters of a scaffold design drawings,a theoretical calculation model with three spans and six steps is built by using ANSYS software.Then a load of 200kN is applied to the whole model and the stability is calculated.The result is compared with the true type test.By expanding the model,the stability of the scaffolds with height being 30m and 45m is calculated.Thus a feasible method of using ANSYS software to analyze the overall stability of scaffold is proposed.