Abstract: This paper introduces methods and key-techniques for environmental design of low noise emergency power generator using internal combustion engines in special buildings.Technical parameters of power generator are studied for the project feasibility.To solve the base-inertia-damping and thermal problems,we adopt methods of anti-structure combined with cooling-path to lower anti-pressure-consuming and meet the acoustic requirements.The results show that this method can solve the lower-noise-radiation and power consumption problems.