Unreasonable administrative diversion and lack of construction funds resulted in the following situation: the intercity buses have become more and more difficult to survive; projects which were used to help the three cities (Changsha, Zhuzhou and Xiangtan) to be integrated had changed to promoting the economy of one city (Changsha); the “green core” planning has been paying more and more attention to environment conservation and ignoring of cites cluster has gradually caused the three cities to be separated. The above suggest that integration of the three cities is not a simple thing but needs to take a long time to achieve it. Some suggestions will be given to change the unfavorable situation: firstly, Hunan government should coordinate and plan as a whole and make sure that the three cities have accurate position respectively during economic development; secondly, the core green planning should be amended and complemented so as to expand the construction area and increase attraction strength which are good for the development of the combined area; thirdly, all investors should rush into these three cities and establish industries to push the integration of Changsha, Zhuzhou and Xiangtan.