Deformable mirrors is the key element for adaptive optics system, and wave-front fitting capability is the main parameter. The Ansys software is used to calculate the actuator′s influence function. Fitting capability is compared, which is based on the three arrangement schemes (diamond arrangement, square arrangement, annular arrangement) fitting low order primitive aberrations and 1000 frames combination of Zernike aberration. Simulation results show that annular arrangement is the best actuator arrangement schemes of contactless force actuator deformable mirror, and the average root-mean-square value of fitting combination aberration is 0.016 μm； annular arrangement deformable mirror also has a good fitting capability to the defocus and astigmatism when its peak valley value is larger than 30 μm and 15 μm. The influence of a broken actuator on the deformable mirror fitting capability is analyzed. Results show that it has little influence on the deformable mirror fitting capability, its root-mean-square value increment is below 0.01 μm.