Previous studies have explored associations between Tumour Necrosis factor-Alpha (TNF-a) polymorphisms and Schizophrenia. Their results were controversial. We conducted a meta-analysis to clarify the association between TNF-a − 308 G/A(rs1800629), −1031T/C(rs1799964), −863C/A(rs1800630) and −857 C/T (rs1799724) polymorphisms and Schizophrenia. All the studies that investigated the association between TNF-a polymorphisms and Schizophrenia published before 15 October 2020 were included in. The literature were comprehensively searched and identified in 2 English databases and 2 Chinese databases. The...