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Documentary is one of the arts combining video and audio together, and commentary is an important part of the audio sector. It's indispensable to make research on the documentary commentary.Considering some problem and deficiency in the research on documentary commentary, this article takes the two classic documentarise for example: and , which has covered a history of more than 20 years. It mainly compares their commentaries according to this five aspects: content, type, relevance with the image,language style,and the level of audience's acceptance. All these five comparisions go to some change law and trend, which can be overally conclued that the meaning of documentary image has been exploited more deeply and actively through commentary in than in < Discovering the Yangtze River >.It also reflects the progress of documentary production concept and development of its technology, also the grown up of its audiences. Based on this kind of advancement, and according to some problem on commentary writing, this article suggests some bad effect that commentary will probably influence the development of documentary.