By studying the classification of trophic types of more than 130 China's lakes, the results show that 117 lakes are in harmonious trophic type, 88.7% of total number of observed lakes, 96.0% of total area, and 15 lakes in non-harmonious trophic type, 11.3% of total number, 1.01% of total area.The main obstacles of lake resources utilization in harmonious trophic lakes arc eutrophication, and those in non-harmonious trophic lakes, are idiotrophische and salinization. The obstacles in some lakes hinder seriously the economic development of the lake regions.It is one of the important environmental problems in China that should solved be as soon as possible.