The control methods for the digital closed-loop test system for quartz flex accelerometer was analyzed in this paper. Digital control system was designed for the digital closed-loop measure circuit. Compared with the traditional analog closed-loop test system, full-digital processing can improve test accuracy of the system. In this paper, the model of digital closed-loop system was advanced firstly, and then some detailed analyses about the integral controller were modified controller are unfurled. At last, the test result showed the control algorithm was available and the bandwidth of the system was advanced.