On the basis of prior works, the basic principles of interferometric detection are analyzed. The theoretical analysis and mathematical modeling of interferometric detection technique are performed by means of the wave optics theory, plane wave approximation, incoherent superimposition, etc., and the computer simulation is used to confirm the feasibility of this technique. By comparison with the traditional photoelectric detection technique, it is found that the interferometric technique is more suitable to the search of dark and weak objects in the context of strong sky background.