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This paper aims at understanding and analyzing the effects of system-on chip technology on FADEC (Full Authority Digital Engine Control) system. Now FADEC system involves three problems besides basic performances: life-cycle cost reduction, weight reduction and flexibility of system realization. The life-cycle cost is stemmed mainly from avionics obsolescence, system maintenance, advancing performances and system structure. With respect to weight reduction, we take FADEC system structure and realization of every element into account. The flexibility idea comes from OSA (Open System Architecture) and modularization. In view of these three problems, we introduce system-on chip technology and present its advantages. On the other hand, we utilize FPGA (Field Programmable Gate Array), one of media of system-on chip technology realization, to show its challenges. Finally, we have a conclusion that system-on chip can undertake the tasks of FADEC system despite some challenges.