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A new fuel injection equipment, the Electronic In-line Pump (EIP) system has been developed in this paper, in order to meet The China's PHASE III and IV emission legislations. The EIP is a product which is assembled together by mechanical hydraulic and electrical magnetic system, and it includes electronic magnetic pump and electronic magnetic injector. The fluctuation in cycle fuel injection quantity (CFIQ) influences not only on the coherence of the product performance, but also on the quality qualification rate of the product. A numerical model of the EIP system was built in the AMESim environment for the purpose of creating a design tool for engine application and system optimization. The model was used to predict key injection characteristics, i.e. injection pressure, injection rate, injection duration at different operating conditions, etc. To validate these predictions, experimental tests were conducted at the same model conditions.