The tapping flange high strength bolts connection is a new form of connection that is applied to fabricated steel structure and has a broad application prospect. In this paper the experimental study was made to research on the mechanical properties of tapping flange high strength bolts in T-stub connection joints of steel structure, regarding the thickness of the T-stub flange plate and the diameter of high strength bolt as the test paramete that is influenced on its mechanical properties that is made 10 specimens on the test research under the action of one-way static loads, it is observed th...