Abstract: Field of view (FOV) conformity between different channels is an important evaluating indicator of aperture-divided detection system. Accurate estimation of FOV conformity will make positive sense to design and fabrication of aperture-divided detection system. This paper firstly presents the principles of FOV measuring and FOV measuring conformity. Based on matrix scanning measurement, volume and area methods for measuring conformity of FOV between different channels are proposed. Then advantages and disadvantages of three measurement methods in different scenarios were briefly analyzed.Devices for measuring FOV of aperture-divided detection system are set up and degree of FOV conformity of aperture-divided radiometer are measured. Results indicate that: even if parallelism of optical axes among different channels is better than 95%, conformities of volume and area is still possibly less than 90%. Combination of using three methods can have a better understanding of manufacture and assembly of aperture-divided detection system.