[Purposes] This paper explores the design of continuous traffic network considering route comfortability based on traveler's comfort preference, and expands the relevant theories of network design which can provide new ideas for traffic planning and design.?[Methods] In the condition that the route comfortability cannot be directly superimposed, the route comfortability was transformed into a superimposed comfort cost through the?method?combining?quantitative?analysis?and?qualitative?definition. Then, a balanced distribution model of the transportation network was established in the form of variational inequality considering the comfort criterion.?Therefore, a bi?level programming model for network design considering route comfortability was constructed and estimated through the?method based on sensitivity analysis, also this model was verified by a small test.?[Findings] The path flow allocated by minimizing the comfort cost complies with the principle of user balancing, and the total impedance of road network is the minimum when the optimal strategy is adopted.?[Conclusions] The criterion of comfort route selection mechanism can reasonably describe the route selection behavior of travelers with comfort preference, which has certain practicality in traffic network design.