The way of center explosive charge has an important influence on the fuel air explosive(FAE)devices. Through the determination of high speed photography, the maximum dispersal velocity of the coupling charge FAE device is 408.5 m·s^-1, and its calculation is 412.5 m·s^-1 by LS-DYNA. The deviation is less than 1%, hence, the method is accurate and reliable. Using the same method, the dispersal velocity, explosive cavity and temperature of FAE devices with different center explosive charges were studied. Results show that in case of uncoupling FAE devices, the dispersal velocities in different position have a small amplitude difference, which is about 100 m·s^-1. That is to say the velocity distribution is uniform and the fuel efficiency is high while the explosion cavity radius diminishes about one third in the end and presents a distribution of large in the middle and small in the ends which makes the position of second ignition equipment have more choices. At the same time, compared with the coupling center explosive charge, the explosive cavity temperature for the uncoupled center explosive charges drop quickly, which results in a better safety.