Abstract: In this paper, the interactions between two cyclonic vortices in the absence of environmental flow and β effect on them are simulated using a nondivergent barotropic model.A series of experimental results show that the relative movments of binary vortices are very sensitive to the initial distance between them and each relative strength and that the nonlinear vorticity abvection from one vortex to the other can lead to mutual cyclonic rotation and attraction, mergence or repelling which relies on their structure and relative intensity for the critical separation. The stronger the combined intensity, the more difficult the vortices merge into one. β effect plays an important role in the interaction of the dual vortices in that it changes the nature of the mutual attraction and repelling, and results in either smooth drift towards northwest for a merged vortex from components with equal strength, or superposition of β effect and gyroidal movement for that with inepual strength.