In order to avoid the inconsiderateness of force and displacement of the structure in the process of secondary cable adjustment of the suspender force of long-span basket handle arch.Use a 450m long-span basket handle arch as engineering background, the process of the cable the influence matrix increase the weighting coefficient, using MATLAB to solve the weighted least-squares solution of equation, after a small amount of iterative computation, the cable force difference is stable.Research shows that:The relative error of the measured cable force with completion cable forces can be controlled within 5%, fully meet the specification limit requirements.The way of considering the geometric nonlinear effect during finite element calculation reduced the influence of the effect on structure.As a way of accelerate convergence, the weighted influence matrix has uniform convergence speed.