Identifying a disease early to intervene early and improve its prognosis is an immediately understandable concept. Applied to asymptomatic individuals, this concept is called screening, and in fact becomes a complex procedure. This article recalls the nosological reasoning which bases the principles of screening, in particular, Report the principles and the method applied during the first operation of mass screening for colorectal cancer in the wilaya of Bejaia, which took place between January 2017 and December 2019, the results reported rather concern the strategy implemented and its application on the Algerian field which seems to be virgin hence the need to focus on the feasibility of this type of pilot action, We have developed a strategy with the construction stages and their implementation methods which we explain in detail in this article.