In order to investigate the moment-rotation relation of the UHV angle steel tower K-joints, five full-scale tests were conducted. The results showed that the joints of this kind will reach their ultimate moment because of the shear break of bolts that connect the main angle and joint plate. Parameter analysis showed that the bolt number has great influence on ultimate moment and initial rotational stiffness when the other conditions are the same and the range of shape coefficient is 1.97 to 2.10 with the most concentrated in the vicinity of 2. Fitting formula of each parameter was given. Comparison showed that the Kishi-Chen three-parameter power model can predict the moment-rotation relation accurately.
