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Metastasis is the leading cause of death in lung cancer worldwide, and immune escape plays a vital role in the process of metastasis. Clinical studies have proven that Jinfukang (JFK) can effectively treat lung cancer metastasis by regulating T lymphocytes. However, it is still unknown whether JFK plays a role in treating lung cancer metastasis by regulating T-cell receptors (TCRs). To explore the effect of JFK in inhibiting lung cancer metastasis by regulating TCR. A lung metastasis model was established in C57BL/6J and BALB/c-nude mice by tail vein injection of Lewis lung cancer cells. JFK was given by continuous intragastric administration. Anatomical observation combined with hematoxylin-eosin staining was used to evaluate lung metastasis. T cells, MDSCs, and macrophages in the peripheral blood were detected by flow cytometry, and the proliferation and immune cell infiltration of lung metastases were observed by immunohistochemistry and immunofluorescence. The diversity and gene expression of TCR in peripheral blood and lung tissues were detected by immune repertoire sequencing, and bioinformatics analysis was carried out. Compared with the control group, the number of pulmonary metastatic nodules in JFK-treated mice showed a decreasing trend, and it significantly reduced the burden of lung tumor metastasis in mice. We found that the expression level of Ki-67 protein in lung metastatic tumor tissues of mice treated with JFK was significantly reduced, while the infiltration level of CD8+ T lymphocytes and NK cells was significantly increased. In addition, we also found that JFK could significantly increase the proportion of CD4+ T, CD8+ T and NKT cells in the peripheral blood of mice. Moreover, JFK reduced the ratio of M-MDSCs and increased the ratio of PMN-MDSCs in the peripheral blood of mice. JFK increased the ratio of M1 macrophages in the peripheral blood of Lewis tumor-bearing mice. The sequencing of TCR in the peripheral blood and lung tissue of mice indicated that there was no notable difference in TCR diversity as the tumor progressed and JFK treatment was administered. However, the downregulation of TRBV16, TRBV17, TRBV1 and the upregulation of the TRBV12-2 gene in the TCR caused by tumor progression can be reversed by JFK. These results suggest that JFK may upregulate the proportion of CD4+ T, CD8+ T and NKT cells in peripheral blood, reverse the TCR changes caused by tumor metastasis, and promote the infiltration of CD8+ T and NK cells in tumor tissues, thereby inhibiting the growth of tumors and ultimately reducing the burden of lung cancer metastasis. This will provide new strategies for developing Chinese herbal medicine to treat metastasis by regulating TCR. [Display omitted] [ABSTRACT FROM AUTHOR]