Due to the influence of subjective factors, the limited equipment allocation for strongholds in the defensive battle of plateau mountain passage may cause equipment unreasonable allocation, so to explore using weighted interpretative structure model method. Combining allocation of current equipment and considering qualitative and non-quantitative factors in the interpretative structure model, the method of weighted interpretative structure model is improved on the basis of the original model method. Taking the correlation degree of various equipments as the initial parameter and using quantified methods, the paper also studies schemes of different types of equipment allocation in the defensive operation of plateau mountain channel in target with the optimal scheme. The new model test results show that the importance of each equipment element matching from the model is in line with the priority from the practice, which provide commander with the optimization scheme of equipment allocation of each element.