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In order to meet customer needs (e.g. safety, convenience) in current automotive industry, lots of electronics and software are deployed into vehicles, and this has led to many researches about In-vehicle network. FlexRay is a kind of In-vehicle network protocols and it will likely become de facto standard. However, to be used in vehicles successfully, the response time analysis of a FlexRay message is needed. In this paper, based on frame format, physical transmission rule and payload length, the actual length of FlexRay message frame is calculated, and we also determine the length of static slot in a communication cycle. Finally, the equation of network utilization in static segment is derived.