The invention discloses radiation property testing method and system. The method comprises the following steps of: constructing a notebook computer placing method and a wireless data terminal testing model of the notebook computer; establishing a spheric coordinate system by using an antenna of the wireless data terminal as the origin point, and selecting a testing point in the spheric coordinate system; placing the testing model in a full dark wave chamber to enable the wireless data terminal to work in a data mode, utilizing the measuring antenna to collect the total radiation power in the testing point of the spheric coordinate system, and then obtaining the total radiation power of the wireless data terminal. By using the technical scheme, the invention can truly reflect the influence of the original element coupling of the notebook computer on the space radiation property of the wireless data terminal when the wireless data terminal of the notebook computer is in the data mode, and the system has high truth and is easy to use.