Abstract: Urban heat island effect is one of the important factors affecting urban ecosystem and urban ecological civilization construction.As an important part of the urban ecosystem, the park has a high ecological service function.Its layout and quality reflect the quality of life in a city, and play an irreplaceable role in promoting the sustainable development of the city and guaranteeing the security of the city.The land surface temperature was obtained by using remote sensing image inversion technology, and the mitigation effect of park on urban heat island effect in Kaifeng City is discussed by comparing the distribution of land surface temperature caused by different periods and different surface features.