中文摘要：

西南岩溶区高品位旅游资源丰富且种类齐全，但其独特的岩溶地质环境对旅游开发建设、旅游接待经营响应十分敏感。本文立足于“人地共生”的生态旅游理念，以污染、风险、干扰、垄断四大指标为依据，选取了12项评价因子和5项修正指数，构建出PRIM标靶评价模型。通过该模型可计算出生态旅游指数进而定量化评价岩溶区旅游开发项目的生态旅游开发态势；还可根据四大指标在标靶模型中的收敛程度和极轴分布，判定评价目标所存在的主要问题及应采取的相应措施。笔者结合路南石林、桂林漓江和福建天鹅洞三个案例，对PRIM标靶评价模型进行验证，评价结果显示，路南石林、桂林漓江生态旅游指数稳定，属于标准的生态旅游景区，但垄断指标较高，后期需要调整旅游收入再分配比例；福建天鹅洞属于准生态旅游景区，在旅游安全措施、开发垄断等方面还存在不足，需要进一步完善。

英文摘要：

Southwest China karst area is one of the main karst zones in China and also the tour focus in the world. Because of the unique karst landscape and the virgin environment the ecotourism has developed rapidly there in the past 20 years. But lots of environmental challenges aroused and the development decelerated heavily for its special karst environment and environmental vulnerability. Therefore, the karst ecotourism theoretical system is advanced based on former theories and an evaluation model named PRIM model is founded. The PRIM model is made up of 4 parameters （Pollution, Risk, Interaction and Monopolization）, 12 factors and 5 modified indexes. By discussing six tourism elements with PRIM model, the development model to karst ecotourism is brought forward for social/ environmental/ economic efficiency and fit for Southwest China karst region. The ecotourism situation of evaluated object can be indicated by value of Et which is the result of the PRIM model. By the way, primal problems and perfect measures can be brought out by the value of 4 parameters （Pollution, Risk, Interaction and Monopolization）. The PRIM model was applied to evaluate the ecotourism situation of Lunan Stone Forest, Lijiang river and Tian＇edong cave. By the results, Lunan Stone Forest and Lijiang River are normative ecotourism and the value of monopolization parameters is high, but Tian＇edong cave proximate ecotourism and the risk and monopolization parameters are sensitive. The PRIM model is the first mathematical model to evaluate ecotourism in vulnerable karst area, and it is an attempt to set up a mathematical model to develop ecotourism theories. The study is beneficial to karst ecotourism development and the frontier of tourism knowledge.