In order to investigate the interaction between the layout concept of dense-network with small-scale road and the road network capacity, a road network capacity model based on classical idea of time-space is set up for the evaluation of capacity reliability in this paper. In the model, the characteristics indicators of the road network capacity model is defined which considering the road network structure, road network density, road width, traffic organization and intersection. Two angles which include the mechanism of road network layout and the process of individual path selection are summarized to analyze the impact of dense-network with small-scale road network layout on road network capacity, respectively. The key indicators which impacted on road network capacity are filtered by the causal chain of system dynamics. A calculation model which describe the relationship between the time-space resource of road network and individual time-space consumption is discussed. The calculation model, which considering the service level, traffic organization, cross-sectional form, supply and demand matching level, is amended by adjusting the key indicators. Numerical study on the 1 km * 1.2 km road network is presented to demonstrate the validity of the proposed model and algorithm. At the same time, the road network capacity under the wide-sparse road network layout is fully examined.

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