The essence of functioning of present-day systems of disasters risk management is information processing for decision making in target domain of risk management. Risk management is the specific field of situational management. Disasters is a result of evolution of situations concerned with different environment natural, technogenic, and human activity processes. The main purpose of disasters risks management (DRM) systems is to provide organizational and technological services to participants in risk management processes to perform the functions assigned to them. DRM system is a complex organizational and technical system. The result of its configuration should be accorded with the architectural model of the organization and cover all levels of organizational and technical means that ensure its operation. Ad-hoc architectural views should reflect point of views concerted with situation context (semantics), stakeholders’ positions and available required management means. Organization of DRM system based on ad-hoc architecture approach is proposed in the paper.