A new type of dual frequency dielectric band-pass filter is proposed for achieving light weight, higher Q value and low temperature drift coefficients. The filter consists of dielectric cavity and dielectric resonators which are made of the same material. There’s no need of measures to fix the resonators in the cavity and the surface of the cavity is coated with a layer of silver. The two central frequencies of the proposed filter are 3.18 GHz and 3.78 GHz respectively, and 3 dB bandwidths are 60 MHz and 23 MHz respectively, and the return loss at the center frequency is less than -30 dB.