In order to establish a scientific traffic assignment model for the travel comfort，the network equilibrium model of comfort travel preference was established by exploring the definition and quantification of link comfort. Travelers were divided into two types of speedy preference and comfort preference. The multi-user mixed equilibrium model equivalent to the mixed equilibrium condition was established，assuming the simultaneous existence of two types of travelers in the network. The MSA solution algorithm for this mixed equilibrium model was then designed. The results show that the equilibrium flow distribution pattern formed by the comfort route selection behavior is obviously different from that of the speedy equilibrium flow distribution pattern. The network equilibrium state caused by the two route selection behaviors is a particular case of mixed equilibrium. The establishment of the comfort traffic assignment model to describe the route selection behavior of travelers can make up for the shortage of the traditional traffic assignment model. It can also accurately predict the traffic flow distribution pattern of the network，providing new idea for the traffic management scheme.