Objective: To investigate the relationship between SNP of mTOR, mLST8 gene and non-traumatic osteonecrosis of the femoral head (NONFH) and its TCM syndromes. Methods: Five SNPs selected from mTOR, mLST8 gene were used to detect SNP typing by MALDI-TOF MS technique. Results: Strong linkage disequilibrium exists in rs26865 and rs27425 of mLST8 gene. There was significant difference in the distribution of GT, AT haplotype between the cases group and the control group (P