Based on the experience and lessons from previous control of lakes,as well as the present situation of water eutrophication and outbreak of blue-green algae in lakes,general ideas of controlling outbreak of blue-green algae in large and middle lakes were proposed. Firstly,it is needed to control serious outbreak of blue-green algae and then build health aquatic ecosystems and corresponding control goals finally. Secondly,quantity of blue-green algae in lakes and lake eutrophication should be reduced at the same time. Thirdly,quantity of reduced blue-green algae must exceed the natural increase of them in quantity persistently,so that outbreak of blue-green algae will reduce and even be eliminated. Fourthly,engineering measures and corresponding safeguard measures to control outbreak of blue-green algae in lakes should be combined.
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