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Postmortem interval （PMI） estimation is a major problem in forensic medicine and a vital indicator of crime investigations. Forensic entomology provides a new way to the PMI estimation, and its superiority has been confirmed through many cases, especially in relation to the cadaver at the stage of advanced decomposition even skeleton. The technologies of forensic entomology have become more mature. This review describes the mechanism of forensic entomology used for PMI estimation, emphasizes the standardized application of technology, and lists the data for the reference of forensic experts in China.