Recursion Formulas for Caculating Distributions of Queue Lengths in Queueing Models

From the starting of the queue length process itself,this paper directly studies the distribution of the queue length in the M/G/1/∞ queueing model by using the Laplace transform tool.The recursion express of the Laplace transform of the transient queue length distribution at any time t and the recursion formula of the equilibrium distribution for calculating conveniently are obtained.At last some more useful recursion formulas for calculating are given in several special queueing models.