1. A method for security-inspection of a liquid article with dual-energy CT, comprising the steps of: acquiring dual-energy projection data by dual-energy CT scanning at a plurality of positions on the liquid article to be inspected; performing CT reconstruction on the dual-energy projection data to obtain a CT image which indicates at least two physical attributes of the inspected liquid article; extracting the at least two physical attributes of the inspected liquid article based on the CT image; and determining whether the inspected liquid article is suspicious according to the extracted physical attributes of the inspected liquid article and the inspected liquid article's reference physical attributes.