This paper introduces the successful experiments to determine the ¹⁴C dating of the samples by using the chemical treatment of lithium carbide(Li₂C₂). The key of the success lies in the restraining of the sublimation of lithium^ The authors suggest the principle and programme of innovating the cooling equipment of lithium reactor in this paper.The results were satisfactory.By using this method the ratio of transformation from CO₂ to C₂H₂ could reach as high as 98 percent, while by using SrC₂ method, the ratio is 70 percent.40 ¹⁴C dating data are published here.Among them four data were compared or rectified with the data measured by other laboratories.They all showed very good coincidence.