A warhead requires the most suitable HE (High explosives). It is necessary to determine the optimal casing and HE in the development stage of the warhead by repetition of a series of process design, trial production, and testing. Accuracy of the simulation (Hydro-code) results also requires a practically usable level. However, we have asked for the JWL (Jones-Wilkins-Lee) parameters numerically by using KHT (Kihara-Hikita-Tanaka) code, since we have not experimental instruments like a streak camera and these experiments spend great deal of time and cost. For this reason, the simulation result was different from the experiment one slightly. Recently, we can ask for the JWL parameters experimentally, using the image converter camera of Kumamoto University by the joint research activities. We hope that the accuracy of these simulations might be raised by these studies. As sample explosives, PBX (Plastics bonded explosives) which used RDX or HMX, and Comp.C-4 were chosen. Further, new explosive of which detonation velocity was decreased by adding GMB (Glass micro balloon) to Comp.C-4 was made. These explosives were studied by KHT code and experiment, and JWL parameters were also gotten. As the result we could get several information, so it would be reported in this paper.