In order to ensure the stable operation of the hydraulic structure of construction machinery, a load sensitive brake system was designed based on the composition of load sensitive brake valve, and a load sensitive hydraulic cylinder brake control system with energy storage was further presented. ARX-RBF model was highly applicable to the nonlinear system with complex structure. According to the output results, it could quickly predict the operating state of the controller and correct the error parameters, so the error was smaller and the optimal control state could be achieved. The results show that the fuzzy ARX-RBF model has high accuracy in fault diagnosis, and the model has obvious advantages in analyzing load-sensitive hydraulic cylinder braking system.