本文论证了在滇池草海中恢复沉水植物并建立以优化的沉水植物为基础的湖泊生态系统，是利用水生植物治理草海的最佳生物防治措施。这种以优化的沉水植物为基础的湖泊生态系统优于以浮游植物或以漂浮植物为基础的湖泊生态系统。结合水生植物的综合利用，它是一种一举多得、经济而又实效的治理手段。

The thesis has expounded and proved that the recovering of submerged vegetation and establishing lake ecological system based on optimal submerged plants are the best biological treatment for the pollution of Dianchi Caohai Lake. This ecological system is better than those which base on phytoplankton or neuston vegetation. To combine with the multiutilization of hydrophytes, it is advantageous in economic and effective treatment.