The aim of this article is the proposal of the safety analysis for complex dynamic technology systems in process of the development of control system for safety-critical processes. The method of safety analysis depends on safety-critical states of system which are system are controlled by models. In our article we propose to use the method SQMD for modeling these states. Method SQMD combines qualitative and quantitative methods for modeling states and takes advantages of both methods.

 The proposal of safety analysis is shown by activity diagram. The article also includes the proposal of the removing and reducing risks.