Height control is one of major concerns in historical and culture environment protection. The paper concerns that how to create good overall height order and proper handle relation between heritage protection and social economic development under precondition of meet demand of basic height control in historical and culture heritage protection area. The paper takes Qu Jiang New District of Xi'an as an example through comprehensive analysis of various factors such as heritage protection, visual line analysis and urban morphology, etc. It is also focuses on quantitative approach of height control in outer space of historical heritage from perspective of visual line analysis and so on. It is concluded that under the conditions of adequate focus on the value of urban space, the sudden increase of the height outside the protection areas should be avoided in order to have a more active overall environmental outlook of the city.