:The zoom system can search for the target with a large field of view , but the off-axis aberration of the large field of view will seriously affect the off-axis imaging of the card structure. In order to achieve the requirements of continuous zoom with a large field of view and a long focal length at the same time , a corrective lens is added to the image side of the card structure , and an infrared continuous zoom system with a working field of 0 ° ~ 1. 5 ° and a focal length range of 800 mm ~ 1 600 mm is designed. The system is composed of seglin telescope structure and three-com- ponent mechanical compensation zoom structure system. The working wavelength is 1 064 nm , the maximum aperture is 300 mm ,and maximum distortion at each focal length is less than 0. 5% . At 17 lp/mm , the MTF at each focal length is greater than 0. 5 , which is close to the diffraction limit. The size of the diffuse spots is very small , all of which are in Airy spots. The aberrations in all fields of view are corrected , and all the indexes meet the design requirements.