Arid area is classical mountain-oasis-desert ecosystem in North-west China. As the ecosystem has its nature geography
character obviously, it has superior to research with remote-sensing and geography information system. The study on
arid ecosystem in RS-GIS' way is focused on that the landscape spatial pattern of complex MODS ecosystem, the
dynamic development of Land use/land cover, the security of ecological environment of eco-tone and so on. At the same
time, the research on the single system is more and more, which has provided more ways and deeper fields of arid area
using RS-GIS. Through the use of RS-GIS, desertification, oasis' development, urbanization etc. can be known, which
would provide precaution for human-being and suitable ways to adjust the problems.