Abstract: Active optical technology can reduce the impact of space environment on the imaging quality of space telescopes. However, with the increasing demand for large swath images in the remote sensing field, existing active optical technologies are unable to meet the requirements of wavefront detection and reconstruction in large field optical systems. To address this issue, we proposed a wavefront detection method only requiring 3 wavefront sensors and 1 deformable mirror. This method could successfully obtaine wavefronts from multiple fields of view by opening holes at corresponding positions on the detector board and wavefront sensor, utilizing light information outside the image plane. In addition, wavefront reconstruction was performed using an algorithm based on Zernike polynomials. Simulation analysis shows that the wavefront reconstruction accuracy of this method is higher than λ/100, which meets practical engineering requirements and effectively reduces system volume and weight.