A simple and effective design method for high cut-off frequency Schottky barrier diode is proposed and implemented. The cut-off frequency of the processed Schottky barrier diode is about 800 GHz， which can reach about 1 THz with the optimized parameters through the test results and simulation data in SMIC 180 nm process. The integrated detector including antennas， matching circuit and Schottky barrier diode is completed， whose tested responsivity could achieve 130 V/W and noise equivalent power is estimated to be 400 pW/ at 220 GHz. The imaging experiment of invisible liquid surface in ceramic bottles has been completed and good results have been achieved.