We experimentally demonstrate a broadband microwave photonics phase shifter. This phase shifter utilizes the free-carrier dispersion effect in a silicon microring resonator (MRR) with P-N junction. We characterize the phase and amplitude response of the MRR at different bias voltage. Experimental results show that a microwave photonics phase shifter with a bandwidth from 10 GHz to 15 GHz and a tuning range of 176 degree is realized by varying the bias voltage from 0.7 V to 0.9 V. The tuning speed of the microwave photonics phase shifter can be up to 1 ns according to the testing results of MRR.