Strong earthquake brings great loss to people's lives and property, post-disaster reconstruction task is urgent and arduous. Managers need to make a comprehensive and scientific decision-making according to the principle of people-centered, scientific planning, overall consideration, step-by-step implementation, self-reliance, national support and community help,and make reasonable distribution to the huge input of human and material resources to achieve their maximum effectiveness. The paper uses system modeling ideas and methods of co-ordinating plans to explore this issue, from the perspective of post-disaster reconstruction overall situation, establishes a mathematical model of reconstruction's prior recorder and meeting the limited resources,and offers theory support to reconstruction task's reasonable statistics planning, with a view to enlighten and help decision-maker.