The climate changes for a long time ceased being a scientific curiosity. They constitute the major environmental question which dominates our time and the major challenge to which must answer the environmental organizations of control. Water, one of the most important raw materials in Algeria. Because of its importance, it is essential to know its vulnerability with the climate changes, in Algeria. In Algeria, the vulnerability with the climate changes is expressed through several aspects: demographic explosion, probable reduction in the water run-offs, scarcity of the resources, the degradation of the hydraulic infrastructures, threats at wetlands... etc. Face this situation, Algeria took quantitative and qualitative measures adaptive within the framework of a durable management of this invaluable resource for the future. [ABSTRACT FROM AUTHOR]