A method for measuring a voltage standing wave ratio (VSWR) without another test device for testing a radio unit of a base station in a mobile communications system is disclosed. The method for measuring a standing wave ratio for a transmission antenna in a base station of a mobile communications system, which includes at least one transmission antenna, comprises the steps of: (a) generating a test signal by using a given test terminal included in the base station and transmitting the generated test signal to the transmission antenna; (b) upon the test signal being transmitted to the transmission antenna, measuring the strength of a forward signal and a reflect signal for the transmission antenna; and (c) obtaining the difference between the strength of the forward signal, and the strength of the reflect signal and calculating the standing wave ratio for the transmission antenna by using the difference therebetween. A similar method is employed for measuring the standing wave ratio for a reception antenna. Moreover, in another embodiment, a valuable attenuator is adjusted to make the forward and reflect signals equal, and the adjusted signal is used to calculate the VSWR.