Background and Aims. Liver depression and spleen deficiency syndrome (LDSDS) and spleen-gastric damp-heat syndrome (SGDHS) are two representative syndromes of chronic hepatitis B (CHB) based on our early researches, and both of them exhibit significant differences in the pathogenesis and prognosis, which is closely related to immune regulation. However, the underlying mechanisms are largely unknown. This study aimed to better understand the immunoregulatory mechanisms of the two syndromes and promote the differentiation precision of the two syndromes in the clinical.Methods. We studied the content of T lymphocytes by Flow cytometry and the expression levels of HMGB1-PTEN pathway proteins by enzyme-linked immunosorbent assay (Elisa) in the two syndromes and healthy controls, then constructed a protein association network through STRING database and the GeneMANIA database to analyze the functional expression correlation among the HMGB1, PTEN, PI3K, PDK1, and Akt. The correlations between T lymphocytes and proteins were analyzed by constructing multiple regression equations and Pearson test.Results. The CD8+T cell levels in the two syndromes were lower than that in healthy controls, and the levels of Th17, Treg cells, Th17/Treg and HMGB1, PI3K, PDK1, Akt were higher than those of the healthy controls (P<0.05). Moreover, compared with the SGDHS, the levels of CD4+T, Th17 cells and HMGB1, PTEN, PI3K in LDSDS were higher (P<0.05). Protein interaction network indicated that HMGB1 can regulate PI3K/Akt pathway through multiple pathways and has strong relevance. The EGFR may be a key target in HMGB1-PTEN protein network. The regression analysis showed that there was a linear correlation between the HMGB1-PTEN pathway axis and the level of immune cells, and the linear correlation factors of the two syndromes were inconsistent.Conclusion. HMGB1-PTEN pathway may play an important role in regulating the formation of immune differences between the two syndromes. CD4+T and Th17 are two representative immune cells which may serve as two potential biological markers of LDSDS and SGDHS in CHB patients.