The invention relates to the technical field of a lithium battery, in particular to a process for screening ternary lithium ion single batteries according to the polarization performance and performing PACK. The process includes the steps of grouping the batteries to be charged to a certain SOC according to the polarization performance and the consistency, and performing PACK after grouping. Afteradopting the above process, the batteries are grouped according to the polarization performance of the battery, that is, the self-discharge performance and the direct current internal resistance performance, and the single batteries with high consistency are screened out to subject to PACK to improve the module system performance, and the ternary batteries can be grouped according to the method during mass production, the batteries with higher consistency can be more accurately screened, and the cost of controlling the capacity grading environment temperature of the battery can be reduced.