A doubleloop proportional, integral and differential (PID) control method is designed to control the platform level and isolate the external disturbance in order to solve the problem that the seaborne and airborne gravimeter need to maintain a stable vertical orientation at all times in gravity measurement. In view of the existence of dead zone in torque motor design, a dead zone compensation function is proposed to reduce the influence of the motor dead zone on the control precision. For the problem that the doubleloop PID parameters are difficult to tune, an optimized differential evolution (DE) algorithm has been designed to reduce the workload of parameter tuning. The simulation and experimental results show that the system based on dualloop PID control and dead zone compensation has high stability and the control accuracy is better than 30 arc seconds. The parameter tuning of the improved DE algorithm is superior over the GA algorithm and PSO algorithm, and the calculation is less.