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This paper makes a fbmial analysis of the specification of a novel railway system, PfirPB systeml which is proposed by the authors. Firstly, on the basis of analyzing the requirements of the actual system, it established the specification of the AI"PB system by VDM++. Secondly it proved the internal censistency which can guarantee there is no runtime error; and then it validated the satisfiability, which is used to make sure that the specification satisfies the requirement. At last, itdoi:10.11348/reajsym.2011autumn.24.0_49 fatcat:phkuwfny3zdydktfmjtwci3jhq