Abstract: We present the contour dynamics for the motion of vortices with several closed contours influenced by the Colioris force, by which six numerical computations are performed. The phenomenon of the counterclock-wise loop of a moving vortex is clearly shown, and the changing asymmetry with time may serve as a precursor for this phenomenon. Meanwhile, we also discuss the dependence of the vortex shift upon its tight-broad distribution, and the dependence of the westward component of the vortex motion upon its asymmetric structure. The results are in the main consist with those of the previous analytical works and numerical experiments.