The invention discloses an object feature information detection system, which is used for measuring a test body. The detection system comprises a transmitting antenna, a receiving antenna and a processing module. The transmitting antenna transmits an output wave beam to the test body and receives a corresponding reflected beam of the test body; the receiving antenna receives the output wave beam; the processing module is connected with the transmitting antenna and the receiving antenna; and the processing module determines channel capacity according to the output wave beam received by the receiving antenna, calculates feedback coefficients through statistical calculation according to the reflected beam in a time domain, generates material information of test body corresponding to the channel capacity, describes appearance contour according to the feedback coefficients and judges appearance contour feature information according to a judgment program. Therefore, the material information and feature information of the test body can be obtained conveniently and accurately, and detection efficiency is improved.