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CPS is a kind of networked embedded system. Its trustworthiness and cost are impacted by energy consumption. So design a low-power, high trustworthiness CPS has been a major challenge. Modeling and analyzing the energy consumption of CPS software architecture at design stage can help to find the energy consumption design defects. These methods can effectively improve the trustworthiness of the CPS software and reduce development costs. Against this problem, first introduce the concept of the energy consumption time Petri nets; then through analyzing the characteristics of the CPS software energy consumption, use energy consumption time Petri nets to construct the CPS software architecture energy consumption model and discuss the energy consumption problems of CPS software such as lowest energy consumption, largest energy consumption and average energy consumption; Finally, indicate the effectiveness of the proposed method by an instance.