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The extreme seismic proof capability[1,2] for equipment of precision factory is about 200gal.When the accelerative motion of foundation exceeds 200gal.it will cause the equipments to be damaged.The ordinary dampers provide insufficient shock absorption capability.They cannot satisfy the requirements of preventing the destruction of factory structure and shockproof of various equipment.Therefore, this kind structure of hi-tech factory needs to be added more dampers to increase quakeproof capability.Nevertheless.added some dampers not only increase the cost of construction but also influence renovating equipment.The unit elevated roof for isolated tactic of Hi-Tech factory is proposed in this research.