Aiming at the disadvantages of the optimal selecting-satellites algorithm in the dual system integrated navigation mode, such as large computation, complex hardware design and poor real-time performance, a fuzzy selecting-satellites algorithm based on BDS/GPS dual system integrated navigation model is proposed, First explains the necessity of using BDS/GPS dual system navigation mode in the range test, then the key influencing factors of the positioning accuracy of the integrated navigation system are analyzed, and the number of available satellites and the selection method are analyzed, and gives detailed calculation procedure for a fuzzy selecting-satellites algorithm based on BDS/GPS dual system integrated navigation mode. The experimental results show that the algorithm is simple, high precision, good real-time performance, and it is of great reference value for the navigation and positioning of the range test items.