A novel photonic technology for microwave frequency measurement utiliz ing polarization modulator (Polm) and single mode fiber (SMF) is presented and experimentally demonstrated.Firstly,t he phase modulated and intensity modulated signals can be simultaneously generated at the out of the different po larizers.Then,the phase modulated and intensity modulated signals will be transmitted along the same fiber and suffer from the same dispersion of fiber.Owing to the dispersion of fiber,the complementary frequency responses are obtained at the ou tputs of two paths. An amplitude comparison function (ACF) between the microwave power ratio and the microwave fr equency is established.The microwave frequency is estimated by measuring the microwave power of two paths. Moveover,only one laser and SMF are adopted to keep the optical power of two paths relatively stable.The exp erimental results show that it can not only realize broadband instantaneous frequency measurement in the range from 1G Hz to 12GHz with a measurement accuracy better than 0.2GHz,but also reduce the system error of measured micro wave frequency.Therefore,the stability is enhanced.