Based on field investigation, experiments in typical sample plots and long-term observation, service function of forest ecosystem in Jinyun Mountain of southwestern China in 2010 was evaluated. Totally seven kinds of ecological service functions of four typical forest types were studied, including water conservation, soil conservation and fertility maintenance, CO2 fixation and O2 generation, nutriment accumulation, air purification, biodiversity protection and forest recreation. Results showed that the total value of forest ecosystem services in Jinyun Mountain was 1.099 billion RMB/ a, and the unit value was 14.46 *104 RMB/ (hm2·a). The order of seven ecological functions was given as followings: forest recreation ( 0.282 billion RMB/ a ) biodiversity protection ( 0.256 billion RMB/ a ) water conservation (0.225 billion RMB/ a) soil conservation and fertility maintenance (0.160 billion RMB/ a) CO2 fixation and O2 generation (0.137 billion RMB/ a) nutriment accumulation (0.036 billion RMB/ a) air purification (0.004 billion RMB/ a). In terms of the unit value of ecosystem service function (except for the forest recreation function), bamboo forest had the lowest value of 6.98 伊104 RMB/ (hm2·a), mixed broadleaf-conifer forest (11.21 *104 RMB/ (hm2·a)), evergreen broadleaved forest (11.07* 104 RMB/ (hm2·a)) and shrubbery (10.84 *104 RMB/ (hm2·a)) got approximately same value.