The "doublesichamber negative pressure method" in a shock tube system for high sound pressure level calibration is provided in this paper. This method can overcome the shortcoming in the high sound pressure level calibration by using electrostatic actuator method which only gives the electricity performance of the calibrated condenser. The composition of the shock tube system to employ this method and test steps are described briefly in this paper, meanwhile a preliminare experiment result of calibrating the condenser CH16 is also given.