Abstract: Aiming at the Angle sensitivity of snapshot imaging chips and imaging optical components, a snapshot spectral imaging system based on field compression is designed. The system consists of a front field compression system, an aperture, a rear imaging lens group and a spectral imaging chip. Through the Zemax optical design of the front optical system, the field of view of ±10° can be compressed to ±3° in the wavelength range of 450 nm~900 nm, and the maximum wave difference is less than a quarter wavelength. The rear lens group is designed to correct aberrations such as chromatic aberration and spherical aberration of the optical system. The RMS radius of each field of view of the whole optical system is close to the pixel size of the array detector, and the relative distortion is less than 0.1593%. Finally, the feasibility of the field compression optical system is verified by experiments, and the imaging system is used to image targets with different color letters and location targets. The results show that the central wavelength of red R is 610nm. Green G center wavelength is 500 nm; The central wavelength of blue B is 460 nm; The central wavelength of red ground and green ground is 613 nm and 517 nm respectively, which further verifies the accuracy of the system.