In the framework of vortex self-organization dynamics,the influences of a small-scale system on the self-organization process of two meso-β vortices are investigated by utilizing an ƒ-plane 2D quasi-geostrophic barotropic vorticity equation model.Four groups of numerical experiments are performed,and the results show that: the small-scale system may change the two vortices interaction and trigger the merging process;the final state is sensitive to the initial location of the small-scale system;there is a "Z" shape sensitive region,when a small-scale vortex initially appears there,resulting in the fact that the interaction stage of the two vortexes is more likely to be changed;for altering the vortices interaction results,the small-scale system should satisfy the following three necessary conditions:an initial position in the "Z" shape sensitive region,proper distances to other two vortices,enough intensity and longer life cycle.