So the correct guidance to the LUD is withoutdoubt the significant way to the optimization of USS (USSO), which is also a majorproblem of the study of our cities.

• 而土地置换正是对存量土地的优化利用，因此对土地置换加以正确引导，无疑会为优化城市空间结构提供一条重要途径。