We all know the constant volume combustion engine acts as a kind of internal combustion engine that is used in the car and truck extremely widely. The cycle is called Otto cycle. I also heard the constant volume combustion gas turbine engine was proposed many years ago and developed a few ones, and soon replaced by constant pressure combustion type. The reason is work frequency and the energy efficiency is low; the engine is rather heavy. But the type of gas turbine engine was made many years ago, so it was restricted by the process and technology at that time. Right now I hope to utilize or develop the advantage the constant-volume combustion type: easy to ignite and easy to get the higher gas pressure.furthly inovate its the motion and structure, at last not only on the aspect of energy efficiency, but also the weight to compete the current gas turbine engine. Here I start the topic that we discuss to design a new motion and structure for the constant volume combustion gas turbine engine that can avoid the weakness I just mentioned.