MAPT (Microtubule Associated Protein Tau) is a Protein Coding gene. Aberrant expression of MAPT has been reported to be associated with several types of tumors, such as gastric, breast, and colorectal cancer, and so on. However, the role of MAPT in HCC (Hepatic carcinoma) is still poorly understood. In our research, MAPT-related data mining and analyzing were used publicly-available data from TCGA, GEO, Oncomine, and HPA databases. The survival curve was shown and analyzed by using Kaplan Meier Plotter. Gene Set Enrichment Analysis (GSEA), TIMER, STRING, and R package were used to explore the function and potential mechanism of MAPT in HCC. The results show that MAPT is overexpressed in HCC samples and is correlated with worse prognosis of patients with HCC. Bioinformatics analysis showed that MAPT contributed to the development of tumors through a variety of mechanisms. In conclusion, the Up-regulation of MAPT was significantly linked to poor prognosis in HCC patients, and it could be a new therapeutic target for HCC therapy.