This paper explored dynamic characteristics of high-speed solenoids considering both attraction and release processes, while the present research was generally limited to the attraction process. An electric-magnet-mechanic coupling dynamic mathematic model of high-speed solenoids was established, and an incremental equation for the dynamic force was derived and analyzed which proved that the dynamic characteristics could be obtained indirectly from the static characteristics. Experiments and simulations of conical pole and planar pole high-speed solenoids were carried out with varied structural parameters respectively. And the comparison of dynamic characteristics of two solenoids indicates their suitable application ranges. The research results provide an effective reference for engineering design of high-speed solenoid.