Abstract: Through an experimental research on static load-carrying properties of 2 groups of multi-planar complex tubular joints (4 joints) ，the effects of different structural type of the joints on both flow of stresses and damage modes were discussed. A special self-equilibrium spatial loading installation was designed for all tests of the scaled specimens，and the limit states of bearing capacity of the two groups of joints with different ways of being internally stiffened. Reasonable suggestions on design were proposed according to damage modes of the joints obtained by the tests: sufficient bearing capacity of 67FB joint was guaranteed with the two kinds of internally stiffened configuration;cross stiffeners had to be placed in base tube and are reliably welded with the chord member in order to acquire sufficient bearing capacity of 67EB joint.