[Objective] To evaluate the value of urban forest ecosystem service function in order to provide scientific basis and theoretical support for the continuous improvement of urban ecological environment and economic development.[Methods] Forest ecosystem of Beidaihe District of Qihuangdao City was chosen as the research object. Water balance, alternative engineering, opportunity cost, production cost, carbon tax, market value and subscription intention methods were adopted to evaluate the service function of forests ecosystem including soil and water conservation, carbon fixation and oxygen release, air purification, forest protection and recreation and leisure.[Results] The service function value of forest ecosystem in Beidaihe reached to 1.487 billion Yuan/a. Among them, function value of recreation and leisure ranked first, reached to 1.087 billion Yuan/a, accounted for 73.12% of the total value. The service function value of various forest ecosystem ranked as:leisure recreation > purification of atmosphere > water conservation > carbon fixation and oxygen release > soil conservation > forest protection.[Conclusion] Forest ecosystem plays an important role in urban ecosystems. In particular, the development of tourism can promote the development of economic development in Beidaihe District. To use and manage the forest resources rationally, the sustainable development of forest resources in Beidaihe District will be realized ultimately.