Today, risk analysis methods are used to support decisions made regarding risk management and the development of action plans. In practice, the company is looking for a decision support tool. In other words, the method chosen must make it possible to act without the exact extent of the risk concerned necessarily being known. It is then appropriate to set up a sort of sieve funnel which allows all the risks to be understood and only the most significant to be retained. Among these tools, we find cartography. Its objective is to have an overall inventory of vulnerabilities for all fields of activity. This approach is essential because it prompts the general inventory of risks and their evaluation. It gives an overview to decisionmakers to guide their choices. The maps are then used to monitor the effectiveness of the strategies implemented and form a very relevant communication tool on the state of affairs, the objective of our work. Thus, to be able to describe a method of global analysis of risks that companies encounter either of their own doing, or due their environment, called risk mapping. As a case study, we used the Hamma Bouziane cement factory, located in Constantine, Algeria.