CBD takes a large proportion in total investment attracted in cities. The good and healthy space environment for business is an essential factor to attract external investment. This article analyses main characteristics of CBD to give the crux for decline of space environment quality of CBD at present. Then it puts forward some ideas for solving these problems as well as relevant strategies and methods. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of APAAS