ISP providing network access services has a huge user group; therefore the competition between the ISP providers is extremely fierce. Under the situation that video occupies the most of network flow, providing high satisfaction network services for video users can effectively improve the competitiveness of ISP, in which video Stalling plays an important index. For protecting the privacy of users, most video websites use HTTPS as the application layer protocol for video transmission, so ISP could not get the playback of video users by parsing HTTP packets, and could not directly detect the video users. In this assay, a new method, protocol transport layer Video Stalling Detection Method based on HTTPS is proposed. This method can effectively match the YouTube, Youku, Letv, Tencent video and other major video sources of the stalling event.