In this paper

using Finite Difference Time Domain（FDTD） method

we numerically obtain the broadband frequency response characteristics of a new type of the Photonic Crystal Ring Resonator（PCRR） and analyze the impact of changing the dielectric constant on the transmission characteristics of PCRR.On this basis

we establish a three-wavelength photonic crystal divider

and in connection with the analysis of the dynamic distribution of light intensity in this model

achieve the frequency division at 1 500

1 550 and 1 610 nm.Numerical results show that compared with the transmission characteristics of micro-cavity

PCRR can simultaneously "download" multiple narrowband signals in the multi-wavelength divider

while compared with waveguide coupling

the design of its structural parameters design is more flexible.