UAV aerial grid line surveillance has many advantages like high speed, high reliability, precise allocating ect. But be- cause of its large vibration in amplitude and wide in frequency spectrum, UAV causes blurs in the recorded video. This article concentrates on solving this problem; a set of camera support devices is developed based on gyroscope system. This cradle head with two degrees of freedom is made by a very strong material and electrical gyroscope system, which is based on spectrum PI control algorithm. It can actively isolates the vibration from outside. The test shows that this cradle head system has the ability of power grid line surveillance, it can effectively lower the effects of vibrations from UAV, and the system is practical and feasible.