[Objectives]  To clarify the diversity and occurrence patterns of members of the Tachinidae in Mt. Huangyi Forest Park, Kuandian, Liaoning, China, and identify species that are indicators of forest status and population dynamics. [Methods]  The Tachinidae population in Mt. Huangyi Forest Park was monitored using the net trap method from May to September 2017 and 2018. The species-abundance curve, diversity index, number of individuals, species richness, and the relationship between evenness and diversity, were analyzed. [Results]  162 known species in 4 subfamilies, most of which were in the Exoristinae, were identified. Species abundance relationship supported the niche preemption model. The diversity index was consistent with species richness, but not with evenness. [Conclusion]  Although there are many tachinid species in Mt. Huangyi Forest Park, there are very few common and dominant species, and rare species are localized. This indicates that the Tachinidae community of Mt. Huangyi Forest Park is not stable. Tachina (s. str.) nupta (Rondani) was identified as an indicator species for monitoring the ecological health of forests. Some suggestions for the rational utilization and protection of the forest are proposed.