Abstract: The present invention provides an adapting flange of toilet bowl typically including a main body having a through-hole at the center, and a sealing cap molded over the through-hole, wherein said sealing cap connects to the main body via a circular laminar connection portion, and a suspension link is attached on the top surface of the test cap. Due to the test cap integrated into the flange gasket as a whole body by the connection of the laminar connection portion, so the losing sealing cap will be efficiently avoided, it is convenient to be used greatly.