Abstract: Objective To study the regulation of P63 on expression of MASPIN in ovarian cancer by observe MASPIN promoter activity changes before and after transient transfection of constructed P63 and MASPIN reporter gene plasmids. Methods The MASPIN reporter plasmid, fused with luciferase reporter gene, was constructed and transfected into SKOV3 cells together with P63 (TAP63, ΔNP63) express plasmid transiently. The MASPIN promoter activity was determined in both the transfected cells and controlled ones by Luciferase Assays and the transcription of MASPIN mRNA of them was evaluated with semi quantitative RT-PCR. Results The MASPIN reporter plasmid was successfully constructed and transiently transfected into SKOV3 cells together with P63 (TAP63, ΔNP63) expression plasmid. The data showed among the tested P63 splice variants, TAP63 remarkably activated MASPIN promoter transactivation (P<0.05). No significant difference in the activity level of MASPIN promoter was detected in the SKOV3-vector and SKOV3-ΔNP63 cells (P>0.05). The level of MASPIN mRNA expression was notably enhanced in SKOV3-TAP63 cell after transient transfected with TAP63 express plasmid (P<0.05), but no significant difference among the SKOV3, SKOV3-vector and SKOV3-ΔNP63 cell(P>0.05)was detected. Conclusion TAP63 can activate the transcription activity of MASPIN promoter, as well as regulate the expression of MASPIN. Put all together, these results suggested that MASPIN is a new molecular target of P63.