Abstract: Heat damage is one of the major agricultural meteorological disasters affecting rice production in Nanchong. By studying the occurrence regularity of heat damage and its relationship with the fluctation of rice yield, it could provide a reference for stabilizing rice yield and ensuring the normal production of rice in Nanchong. Based on the data during 1960-2014 from 7 meteorological stations in Nanchong, the authors analyzed the temporal and spatial distribution of heat damage; meanwhile, we combined with rice yield from 1981 to 2014 in Gaoping and the authors analyzed the influence of heat damage on rice yield with the wavelet analysis. The results showed that: heat damage showed mostly mild degree, followed by moderate degree, and then was severe degree in Nanchong; the occurrence frequency of total heat damage showed a firstly decreased and then increased trend; there was lower occurrence frequency of heat damage in 1980s; there was more heat damage in the south than in the north; there was a significant reverse resonance period of 3-4 a between relative meteorological yield and heat damage after 2000. Heat damage becomes a major agricultural meteorological disaster which influences rice yield fluctuation in Nanchong after 2000. The results of the study could provide a basis for relevant departments to formulate rational production layout and defensive measures for heat damage.