Based on the theory of random process and the characteristic of the functioningof a system component subject to a certain specific probability distribution, emulated thewhole process of system production on Iongwall face was emulated, in which the methodsof time pace and computer random emulation were adopted. The paper provides an objective basis for the analysis of a mining longwall face and the varied lines of effectiveness,machine stoppage rate and coal flow of components and system, and output etc.lt alsooffers some theories to improve productivity by discussing the application of the transformation plan and optimization of reasonable coal stock capacity, as well as selection ofsystem equipment and matching optimization. Based on the theory of random process and the characteristic of the functioning of a system component subject to a certain specific probability distribution, emulated thewhole process of system production on Iongwall face was emulated, in the the methodof time pace and computer random emulation were adopted. paper provides an objective basis for the analysis of a mining longwall face and the varied lines of effectiveness, machine stoppage rate and coal flow of components and system, and output etc.lt alsooffers some theories to improve productivity by discussing the application of the transformation plan and optimization of reasonable coal stock capacity, as well as selection ofsystem equipment and matching optimization.