Submitting the documentation and data through single window can benefit the trade facilitation a lot. Therefore, Trade Facilitation Agreement classifies single window terms as B measures and treats it as a flexible and binding obligation. Because of TFA membership, China should honor the treaty obligation and establish a single window on a national scale. The establishment of single window in China has made remarkable achievements; however, there are obstacles in the process comparing with the TFA obligation: the single windows in China cannot meet requirements of submitting documentation and data through “a single entry”; the prohibition of resubmitting is not perfect; the regime of notifying the Committee of TFA is absent; the information technology used in the single window is insufficient. In order to honor the treaty obligation completely and establish the advanced single window, China should meet requirements of submitting documentation and data through “a single entry”, complete the prohibition of resubmitting, construct the regime of notifying the Committee of TFA and use the information technology to support the single window.