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中文摘要：
松花湖是吉林省的重要水源地,随着经济的发展,松花湖的水质正逐年下降.辉发河是松花湖的一个主要污染源,探讨其自净需水量,可有效保护松花湖水资源.以点污染源为例计算了辉发河干流中下游河道自净需水量,结果表明：辉发河河道自净需水量严重缺乏,自净缺水量主要集中在非汛期,但同一河段相同年份各月的自净需水量差别不大,且自净需水量随年径流量变化不大.
英文摘要：
Songhua Lake is one of the important water sources in Jilin Province,but the quality of water in Songhua Lake deteriorates with the economic development.It can protect the water resources of Songhua Lake effectively to discuss the water requirement for self purification of Huifa River,because it is one of the main pollution sources to Songhua Lake.The paper has computed the water requirements for self purification of the stream-channel in the middle and lower reaches of Huifa River according to the point pollution sources,the result shows that the degree of water requirement shortage for the self purification is severe and most of which appears in non-flood season,but the water requirement for the self purification varies little with annual stream flow.
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