Cable joint is a weak link with complex electromagnetic backgrounds in power cable line. The electro-thermal distributions of such cable joint are crucial in determining the rated current of the HV power cable, particularly in the limited underground utility tunnel scenarios. This paper establishes an electromagnetic-thermal interacted numerical modelling of 220 kV three-phase HV cable intermediate joints in triangular arrangement, with the multi-physical fields of each cable joint been calculated and compered. Simulation results show that for the cable joints in triangular arrangement, the temperature of the one phase in top side is higher than the other two phases of about 15%, and the electric field intensity is higher than the other two phases of about 30%. The way the cables are laid in the tunnel may be the key cause of these differences. The research in this paper can be consultation for the optimization of cable laying in cable tunnels and maximizing of rated current.