In order to obtain the best plan, put forward a method of the gun position priority based on triangular fuzzy numbers and TOPSIS. Firstly, the weights of the indexes are expressed by triangular fuzzy numbers. Then the sort order of the triangular fuzzy numbers is gained by its density of the distribution. Furthermore the gun position priority is got by TOPSIS. The application of the method is illustrated with a practical example. The method can serve as a reference for the other order problems.