Forest parks are one of the important kinds of destinations for the development of ecotourism in China. Based on the principles of ecotourism, an evaluation index system of ecotourism development in forest parks was established. This paper uses data from investigations in 27 provinces, autonomous regions and municipalities in China to evaluate and analyze the ecotourism development of China's forest parks. In order to promote the sustainable development of ecotourism in forest parks, the paper suggests a number of measures, such as promoting the integration of the tourism industry and related industries, exploring folklore tourism products, planning an environmental interpretation system, perfecting the infrastructure and service facilities system in line with the principles of ecology, building an environmental monitoring system, setting up a reasonable mechanism for community participation, strengthening capital investment and investment management, and paying attention to the cultivation of professional talent for ecotourism. These measures can be used as references and guides to the development and construction of ecotourism in forest parks in China.