Method and system downloading files through network caching

The invention discloses a method downloading files through network (web) caching. The content files are generated, properties of the content files are additional writing in (append only), and the content files are stored to content providing nodes; when the web caching receives content file requests sent by a user side, transcripts stored in a local mode are detected, and if content in the transcripts is not complete and the properties of the content files are append only, requests are sent to the content providing nodes to obtain content missed by the transcripts; and after the web caching updates the transcripts stored in the local mode, the content files requested by the user side are fed back to the user side. The invention further discloses a system, and high-efficiency web caching processing can be achieved through the method and the system. Meanwhile, network bandwidth is saved, and response delay is shortened.