Goal of the final work „Firing Process of Cannon M-55” is to fully explain process of firing cannon M-55 in a way to show and explain movement of every part and their interdependence while firing. Namely the problem is that today materials which are used in Croatian Army in purposes of showing the process of firing a cannon are reduced on picture display and in big part on own perception, which often leads to the wrong understanding of the firing process itself. In this work will be used program for modelling SolidWorks, by which will firstly be made the models of all parts of the cannon and then will be made virtual animation of the process of firing the cannon. This way of showing process of firing the cannon will allow to the future generations of cadet unambiguous visual insight to the process of firing the cannon and to the construction of the complete cannon. Thereby should be accomplished better understanding with cannon and its parts, which will result with easier handling the cannon, removal of possible misfires while handling the cannon and enable understanding the principle of working.