At present, the hyperspectral imaging technology is widely used in the fields of remote sensing and detection etc. However, in some emerging fields of medicine, material and microelectronics, the passive imaging method has its limitation and unsuitability. A wavelength-tunable staring hyperspectral imaging system is discussed. By using wavelength-tunable monochromatic light, the spectra of an object to be imaged is measured rapidly. In addition, because a grating is used as a light-splitting element, the compatibility and robustness of the system are improved greatly. This research is of reference value to the design of similar imaging systems.