Abstract: Objective: For the southern region of Xiamen Island, there is a high demand for passenger transportation within the region, and the main direction of passenger flow outside the region is towards Hexiang West area and Railway Station area. However, the original route planning scheme for Xiamen Rail Transit Line 3 and Line 7 cannot effectively meet the primary passenger flow travel demands. Therefore, adjustment on this original scheme is needed. Method: Based on the route planning scheme for Line 3 and Line 7 within the southern region of Xiamen Island, and considering the regional land planning and current conditions, the characteristics of regional passenger flow are analyzed. Based on the original planning scheme, five adjusted route planning schemes are proposed. The advantages and disadvantages of each scheme are analyzed in detail, and a comparative selection of the schemes is conducted. Result & Conclusion: Scheme 3, which maintains the original network routing and designates Shapowei Station as an interchange station for both lines, has significant advantages in terms of passenger service, interchange conditions, and engineering implementation conditions, thus it is considered the optimal solution.