Effect of CCS technology for CO₂ leakage on C₄ crops seed germination is simulated so as to provide basic information for the potential effect of CCS technology for CO₂ leakage on environment. With the help of artificial CO₂ climate chamber, the impacts of CO₂ on the percentage, potential and the average days of germination of 4 C₄ corps like corn, sorghum, millet and broom corn millet were studied under the condition of normal, 10000, 20000, 40000, and 80000 mg/kg CO₂ concentration by simulating the environment of high CO₂ concentration resulted from CCS technology for CO₂ leakage. The high CO₂ concentration has little effect on germination percentage of corn, while the germination percentages of sorghum, millet and broom corn millet reach the maximum values at 10000, 20000, 20000 mg/kg CO₂ concentration, respectively. High CO₂ concentration also has no significant impact on the germination potential of corn, while all the germination potentials of sorghum, millet and broom corn millet reach the maximum values in 20000 mg/kg CO₂. High CO₂ concentration has little effect on the average germination days of four kinds of C₄ crop, in which the effect toward broom corn millet is more significant than others. Various CO₂ concentrations have the functions of promotion and inhibition toward the germinating percentage of C₄ corps and however, the effect is not very obvious, in which the promotion range is about 1%~5% and the inhibition range is about 1%~4%. High concentration CO₂ plays more significant role in promoting C₄ crop seed germination potential, in which the promoting range is 9%~16%. High CO₂ concentration has little effect on the average germination days of four kinds of C₄ crop.