Abstract: This paper discusses a model to analyze the medium choice for communication made by individuals. Section 2 turns out that model (2) is a specific form of model (1), and is a more general model. It is argued that two kinds of barriers may exist. The first is the traditional constraints that are in this context interpreted as barriers. The second kind is called relative barriers. It is detected when a certain subpopulation is significantly different from the whole population. Taking 1000 communication users of Shijiazhuang as a sample of communication media (letter and telephone) choice behavior, the authors find that the demographic and socio-economic characteristics of the population determine the form of their choice behavior, and since the profile of a user could not fully be "tested", our prognoses of their behavior are based on generality guesses. Yet despite this limitation, the experiences with communication may be investigated in regard to the time space constraints of users. They form the crucial factors in acceptance of new electronic opportunities.