Abstract: A novel multistate reflectometer comprised of two magic tees and two power detectors is described. Two precise sliding short circuits are used, one is used to perform the calibration of the reflectometer by a calibration method using five unit-vectors with arbitrary phase, and another is used to make the reflectometer switch to different stable states. A vector transfer method is employed to obtain the complex reflection coefficient of DUT. The reflectometer is characterized by separated test and calibration port, simple hardware, and high stability and easy realization compared to the traditional six-port and multistate reflectometer.