Abstract: According to the issue of data flow control accessed by the network service quality,an access mold based on the network calculus was proposed.This paper firstly brought up the equivalent bandwidth model and equivalent capacity model,respectively,which were against the bandwidth calculation in the access control.Secondly,this paper built up the mathematical model in the acceptable region of access control,and analyzed the theoretical significance of this model.At last the emulation experiments were proposed to illustrate the effectiveness of this algorithm.