A two-dimensional(2-D) Photonic Crystal(PC) based THz Bandpass Filter(BPF) is designed. Symmetrical point defects are introduced on both sides of a line defect 2-D photonic crystal to form resonant cavities. Therefore, a fine bandpass property is realized. This kind of 2-D photonic crystal filter possesses large bandwidth. Its out-band rejection properties can be further improved by introducing more pairs of symmetric point defects to realize the cascading of more resonant cavities. The proposed filter can satisfy application requirements in THz communication and radar systems.