A digital micromirror device (DMD) is introduced to the ghost imaging via compressive sampling (CS). In this scheme, the image of object can be obtained using the bucket detector which has no spatial resolution. If the imaging scheme is applied to the multi-spectral imaging, multi-spectral images of object can be obtained using a linear array detector, which reduces the complexity of detector in imaging. The principle of ghost imaging is clarified with the correlated imaging the theory of CS. According to the imaging principle, the experimental demonstration device is assembled, and the object′s image is achieved accurately in the experiment. Ghost imaging and ghost imaging CS are compared to show that the latter has a better performance. Meanwhile, according to the experimental results, the resolution of the imaging system is decided by the size of unit on the DMD when the aperture of lens is big enough. Based on this imaging system, the multi-spectral imaging is carried out. The intensities at different wavelengths are recorded by the linear array detector, and the multi-spectral images of object are achieved in the experiment.