As a kind of load standard equipment, EJⅡ-1 deadweight force standard machine has many advantages, and plays an important role in the metrological system about mechanics in our country. But after many years of use, there will be a fault of reduced repeatability. In this paper, through the study of the equipment design, we analyze the cause of this common fault, and put forward an improved scheme to eliminate the fault and recover the performance for this equipment.