利用FHN模型,我们研究了二维心肌可激媒质系统中一对螺旋波,在均匀的周期小电流驱动下,碰撞湮灭条件。发现:(1)驱动电流的初位相决定螺旋波漂移初始方向;两个螺旋波靠近时,它们之间引起排斥作用;(2)在较大的强度驱动时,适当的位相条件下,一对反向的螺旋波将被驱除边界或碰撞湮灭;(3)在共振驱动时,一对反向的螺旋波较易碰撞湮灭。 Using the FHN model, we studied a pair of helical waves in a two-dimensional myocardial stimulable media system driven by a collimated annihilation condition under a uniform periodic low current. The results show that: (1) The initial phase of driving current determines the initial direction of helical wave drift; when two helical waves approach, they cause repulsion between them; (2) Under the condition of larger phase intensity, Reverse spiral wave will be driven out of the border or collision annihilation; (3) in the resonant drive, a pair of reverse helical wave easier collision annihilation.