The present disclosure provides a method for rendering a PDF file by on-demand loading the PDF file in a network. The method comprises the following steps: acquiring basic data information of a PDF file to be rendered by a user; and according to the basic data information, determining page data block information required for rendering and displaying a corresponding page of the PDF file, wherein the page data block information comprises a quantity, a position, and a size of at least one page data block in the corresponding page; sending a request comprising the page data block information to a server, and receiving each page data block corresponding to the request; and rendering the each page data block corresponding to the request to display the corresponding page, according to the basic data information of the PDF file.