The 1ppm standard gas cylinder is directly connected to 951a calibrator, and the standard gas is collected with different volume quantitative ring, and then the standard gas in the quantitative ring is blown into the concentration instrument and analyzer for calibration (calibration) with a certain volume of carrier gas. Quantitative ring injection realizes the direct injection of high concentration and small volume standard gas. A certain volume of carrier gas is used to purge the standard gas in the quantitative ring into the adsorption tube for concentration, which is equivalent to diluting the 1ppm standard gas in the quantitative ring by the volume of the purge carrier gas. The volume of the purge carrier gas is large and the dilution ratio is high, thus the 1ppm standard gas is diluted to the required ppb level concentration. The quantitative ring calibrator can calibrate the instrument, save the standard gas, and do not need the sampling tank, gas distribution instrument and tank cleaning instrument, so the calibration cost is greatly reduced. 5-6 quantitative ring injection calibration analyzer can be selected to meet the requirements of standard curve preparation. The calibration of various concentration series can be realized by changing the volume of purge carrier gas. The method has good repeatability and high sensitivity