The decomposition method-a new approach analyzing the repairable queueing system is provided

and by using this method the M/G/l queueing system with repairable service station is discussed again.Some decomposition results of two main reliability quantities-the propability that the service station fails at time t and the expected number of failure occurring during the time interval(0

t] are obtained

and further the Gl/G/l queneing system with repairable service station is also analysed.It is noteworthy that the decomposition method provided in this paper is new and concise.