With the rapid growing of domestic rural market, it is important to develop rural logistics system. Up to now, the general two-direction logistics mode was investigated in order to achieve high efficiency. However the mode was still based on qualitative analysis. This paper proposed a novel rural two-direction logistics system model based on SPN theories. By utilizing the mathematic characteristics of SPN, quantitative parameters of the model were deduced. Finally, compared with the general logistics mode, the proposed logistics mode can improve the logistics efficiency.