Abstract: With a careful review of the domestic usage of the icing detector for power lines and the existing problems surrounding powerline icing, this thesis incorporates necessary meteorological statistics relevant to the ice formation, and adopts as its basis classic formulas calculating ice thickness, thereby establishing a mathematic model that readilyprovides scientific icing estimations.To achieve the accuracy of icing measurement, the thesis recommends utilizing the technology of software sensors. Meanwhile, a new powerline icing detector is designed with a singlechip MSP430F247 as the core.The system overall scheme and hardware circuit and software flow chart has been introduced.