本文说明,由于可行性研究的基础资料深度不够,导致投资估算精度不高,推行限额设计缺乏可靠依据。要提高投资估算精度,需要加深可行性研究工作,改革基建程序与内容。但如按常规勘测,就很难奏效。本文从技术勘测方面说明航空勘测的功能和优越性。 This article shows that due to the insufficient depth of the basic data of the feasibility study, the accuracy of the investment estimation is not high, and the quota design is lacking in a reliable basis. To improve the accuracy of investment estimates, we need to deepen the feasibility study and reform the infrastructure procedures and contents. However, as usual surveys, it is difficult to work. This paper explains the function and superiority of aviation survey from the aspect of technical survey.