Since a large number of marine and coastal engineering will spring up,and the demand of islands and water surroundings development will increase,it will inevitably lead to habitat fragmentation.Island has a fragile ecosystem,ecological structure and function,is more vulnerable to damages,and it is difficult to restore to the undamaged state through the system's self-adjustment and self-organization ability.A lot of researches have focused on the island habitat fragmentation problems,but the method is not pe...