A laser-diode-pumped Cr:YAG passively Q-switched intracavity SrWO4 mode-locked Raman laser is used to obtain stable Q-switched mode-locked Raman pulse of 100% modulation depth. An average output power of 968 mW is obtained when the incident pump power is 5.2 W, the conversion efficiency of pump to Raman laser is 18.6%.The Q-switched pulses with repetition rate of 51 kHz and pulse width of 7 ns is obtained. To our knowledge, this is the most efficient at present. And the forming reason of mode-locked Raman laser pulse in the experiment is analyzed. The polarization mechanism is researched and reasonable explanations are analyzed.