关键词: 非结构网格, 区域指示函数, 适应网格, 簧振子, 界引力

Abstract: The paper presents the idea of weak domain indicating function which describes the field and proves the existence and non-exclusiveness for it，then it generates the unstructured mesh of two space dimension domain according to scale function.By boundary attraction the mesh boundary approached the domain boundary and inner-domain boundary，the spring and equilateral triangle approach method optimizes the mesh structure effectually.Finally，spring realizes adaptive mesh by the evolvement of weak domain indicating function and the instruct of the monitor function.

Key words: unstructured mesh, weak domain indicating function, adaptive mesh, spring optimization, boundary attraction