THE STUDY OF MULTI-DROMION STRUCTURES AND INTERACTIONS OF (2+1)-DIMENSIONAL NLBQ EQUATION AND KP EQUATION
（2+1）维NLBQ方程和KP方程的多dromion结构和相互作用的研究

Starting from two-line soliton solution of an integrable (2+1)-dimensional system in bilinear form,one can find a dromion solution that is localized in all directions for a suitable potential.The in-teraction between two dromions is studied in detail through the method of figure analysis for (2+1)-dimensional NLBQ equation and KP equation.Except for a phase shift,there are no changes on the shape and velocity of the dromions after interactions for these models.The interactions of dromions for these models are not only elastic (there is no exchange of energy)but also irrotational (there is no exchange of angular momentum).