For researching millimeter wave power combining technique, a new style low loss millimeter wave microstrip integrated 3dB hybrid, extracting advantages from traditional Wilkinson hybrid, was proposed. It is easily fabricated and with low cost, and its insert loss is about 0.2dB in 32GHz - 37GHz. Based on this new style 3dB hybrid, a Ka-band power combining network was presented, and in 33 - 35GHz frequency band, the combining efficiency about 75% was obtained.