Fujian Earth Building is one of typical Chinese traditional houses famous for unique architectural style and construction techniques. They were widely used in Wuyi mountain passing more than 500 years. How were them built, and how were adjusted to fit their valley environment are interesting questions for each sight-seer, archetects and engineers. This paper try to explain the answers by study the local climate, environment characteristics, historical background, construction technology, structure, material selection, andconstruction location, also to infer how the structure resistant earthquake. The analysis may be helpful for architects and engineers in design practise.