The errors produced in calculating the theoretical values of NSA (the normalized site attenuation) using the 3m measuring method is introduced in this paper. In order to reduce the errors, the related suggestions are made.

• 定量地分析了采用3m法测量，计算NSA（归一化场地衰减）理论值时引入的误差，并为减小这些计算误差提出了一些具体的建议和方法。