1.Introduction The non-construction land(NCL) of a city refers to the lands within the urban planning area delimited by the city master plan that should not be intensively constructed in a certain period of time according to the city master plan.It is usually represented in“blank”or“green”in the land utilization plan of the city beside the con- 1.Introduction The non-construction land (NCL) of a city refers to the lands within the urban planning area delimited by the city master plan that that should not be intensively constructed in certain period of time according to the city master plan. It is usually represented in “blank ” or “green ” in the land utilization plan of the city beside the con-