Firstly

this paper studies road information requirement of ITS oriented digital maps. Single lined road network model based on road node connection is presented. Conventional network based on road segment connection has some difficulties to represent real world road networks

however model presented in this paper works well and can be easily operated. Then

this paper mainly focuses the research of the study of automatic generation algorithm of road network databased of aforementioned model when digital maps is been making. Road segment breaking preprocess is adopted to break all road segment vectors from intersection points. Road nodes and segments information lists are created then

and through modifying the two lists

road network is traversed. Road segments and nodes are coded automatically when traversing

and at the same time topographical information is gotten. After this process

road network database can be constructed with road nodes and segments associating with each other. In the end

special cases of preprocess is discussed on intersection points getting. Experiences show that the model and algorithms presented in this paper are reasonable and feasible.