Modal popup window display method and device

The invention provides a modal popup window display method and device. The modal popup window display method comprises the steps of configuring a corresponding access path for a modal popup window inadvance; and after an interaction event based on the modal popup window is detected, obtaining an access path of the modal popup window, displaying the modal popup window on a currently displayed underlying page according to the access path, and meanwhile, adding a page state mark in a URL corresponding to the currently displayed underlying page, the page state mark being associated with the access path of the modal popup window. According to the scheme, display of the modal popup window serves as a page state of a bottom page of the modal popup window to generate a corresponding page state mark, the page state mark is recorded in a URL corresponding to the page, the page state mark is associated with an access path of the modal popup window, and in other words, the corresponding modal popup window can be uniquely