Abstract: By a study on the theory and experiment of missile launcher making use of a concentric vertical launching device,it is seen that the high temperature jet environment existing around the missile during launching may influence the missile.Through the dimensional design of the shrinking part at the rump of the inside cylinder of the concentric system,the reflection of the high temperature jet can be reduced.Designing an exhaust device at the mouth of the launching cylinder so as to exhaust the jet from with out and with in the cylinder around the launching cylinder,will decrease the scorching from the high temperature jet at the point of the missile launching from the cylinder.The paper makes use of the numerical value method and gives a numerical simulation with the two improved measures.At the same time,experimental study has been made,and it is seen that the two measures bring a certain effect in improving the heat-environment during the missile launching.