In view of the problem that the artillery tube life is difficult to accurately forecast under the random using condition, through the analysis of the heat transfer process of the inner wall of the tube body, introducing internal heat strengthening hypothesis, the calculation method of the highest inner wall temperature is obtained and its the variation regularity of ablation wear and the maximum wall temperature is studied. At the same time, the wear calculation method comes up when artillery is shooting continuously under the circumstance of uncertain gunpowder temperature ,uncertain shooting time interval and uncertain propellant charge. Introduction In the filed of large diameter (100 mm) artillery design, in order to enhance the artillery power ,it has to have higher velocity and firing rate.As the result, it gives rise to more aggravated erosion and wear of cannon gun tube wall inevitably.Cannon gun tube status affects the result of the projectile hit the target directly, and the barrel life determines the life of the artillery systems in a certain extent. Therefore, the test and analysis on the problem of barrel life is of great significance. In view of the random using conditional random problems in engineering application, this paper studies and analyses the barrel inner wall wear analysis model under the condition of continuous fire, provides the scientific basis for the research of dynamic barrel life test and analysis . Tube Wall Erosion Wear Calculation Studies have shown that cannon gun tube erosion wear is mainly caused by three aspects: mechanical abrasion, chemical reaction and thermal ablation[1,2]. Scholars usually analysis the barrel life from these three factors. However, these three factors are not independent. this uncertainty coupling relationship among them. Life Loss Matrixing under Gunpowder Changing Domestic and international scholars summed up the equivalent full charge coefficient conversion method which can more accurately calculate the barrel life loss situation under the different shooting conditions (charge, projectile type) through analysis a large number of experimental laws[3]. After a large number of experiment statistics and data analysis, the national artillery equivalent loading coefficient conversion method is summarized as below: 1.4 0 0 / / m m k p p v v (1) Where: k --conversion coefficient m p -the maximum bore pressure under full charge 0 v -the initial muzzle velocity under full charge m p --the maximum pressure of a converted charge This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Copyright © 2017, the Authors. Published by Atlantis Press. 431 Advances in Engineering Research (AER), volume 131 3rd Annual International Conference on Electronics, Electrical Engineering and Information Science (EEEIS 2017)