Abstract: Bailong Cave Site，located in Yunxi Country，Hubei Province，China，is a more influential Middle Pleistocene human site. In the study program，by means of Total Station Type RS-202N produced by Japanese Pentax Company and software AutoCAD2006 presented by American Autodesk Company，we established the digital model of the cave landform and the digital model of the cave home through insite collecting three dimensional data of the inner and outer of Bailong Cave Site. The digital models provided us not only a dynamical tridimensional viewpoint，but also abundant surveying data and all kinds of special graphics able to meet different research demands. By analysis of threedimensional models，we obtained a series of new opinions. Hominids lived in Bailong Cave Site(Homo. erectus)already had the ability of utilizing natural cave efficiently. Their activities were distinctly concentrated on relatively large and high places of the cave. Simulated illumination analysis by digital model supported the opinion that the hominids might use fire for illumination in the cave. We restored the collapsed section of cave entrance and launched simulated illumination test confirming. Because of complicated configuration of the cave，the direct sunshine only can act at a limited range of the cave home. In 2008，however，we discovered questionable burning evidence at the deeper site. Accordingly，it was quite possible that fire was used to illuminate at the site. Other simulated analyses by digital model also found that hominids lived in Bailong Cave Site developed some inclined adaptive selections for particular environments；    for example，the adaptive selection of complicated landforms of low hills，the adaptive selection of cave homes with a fine view，the adaptive selection of dry cave homes nearby water sources，the adaptive selection of concentration places of rock materials for stone tools，and the adaptive selection of multifood sources. Furthermore，the simulated analyses show that a portion of soil accumulation in the cave perhaps came from deeper caves except that some were results of human activities. The three dimensional digital models of Bailong Cave Site are a preliminary attempt to use three dimensional techniques in human paleontologic sites. Their applicability waits to further development still.