Douding is a website where documents can be freely shared and found: educational materials, thesis courseware, academic reports, financial analysis, original documents and other industries and various types of documents can be found in Douding. Douding supports dozens of file formats, including. pdf，。 doc，。 PPT and Txt, and you can directly show the contents of the file to readers in the form of Flash player on the web page. In short, Douding is like a documentary version of Youku or potatoes. Now tens of thousands of documents are uploaded to Douding every day. Based on this, Douding will strive to build the largest Chinese library in the world.