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The analysis of safety properties of a system is an important way to study correctness of design and implementation, and that is an urgent requirement in some systems, such as hybrid embedded systems. But it is always difficult to make good and accurate safety analyze. We proposed a formalism, TCSP for hybrid embedded systems, by introducing a new operator (emitting signal operator) into TCSP and giving details of its structural operational semantics to analyze formally safe specification of hybrid embedded systems. Not only has safety for actions of hybrid embedded systems been analyzed, but also safety for predicates.