Abstract: Objective:To analyze the expression profile of miRNA-34c in cervical cancer tissue and identify its novel target gene. Methods:The expression levels of miRNA-34c were detected in 34paired cervical cancer tissues and normal paraneoplastic tissues via quantitative reverse transcription polymerase chain reaction (qRT-PCR). Polo-like kinase 4 (PLK4) is a target gene of miRNA- 34c pre-dicted in the miRNA Target Database. Luciferase vector containing the binding site of miRNA-34c to PLK 4 3'UTR and miRNA- 34c mimic or negative control were co-transfected into HEK293T cells, and luciferase expression was examined. The miRNA-34c mimic or negative control was transfected into SiHa cells, and the mRNA or protein expression of PLK4 was detected via qRT-PCR or Westernblot, respectively. Results: MiRNA-34c expression was lower in cervical cancer tissues than in normal paraneoplastic tissues. The miR -NA- 34c mimics significantly inhibited luciferase activation in the HEK293T cells (P<0.01) and significantly decreased the mRNA and protein expression levels of PLK4 in the SiHa cells (P<0.01). Conclusion: MiRNA-34c is significantly decreased in cervical cancer tis-sues. Moreover, miRNA-34c can significantly repress the mRNA and protein expression levels of PLK4 by directly targeting the 3'UTR.