The resonance rule and coupled characteristics of two dimensional triangle lattice photonic crystal ring resonator and micro-cavity are studied. A novel efficient four-channel wavelength division demultiplexer is proposed, which is based on the structure composed by a ring resonator and two micro-cavities. The device realizes the wavelength division demultiplexing with wavelengths of 1471, 1511, 1551, 1591 nm, and the size of the device is reduced significantly. The impact of the ring resonator center rods number and radius on the transmission spectrum is investigated using the finite difference time domain method. The results show that the ring resonator has multimode characteristic and it can adjust the resonance wavelength of the ring resonator by changing its center column radius. By using the micro-cavity frequency selective effect, the transmission rate of each channel reaches more than 90% and the channel isolations are over 20 dB. At the same time, it is simple and efficient, which has potential application value in the field of all optical communication integration.

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