The invention provides a red-and-green area identifying and evaluating method for an urban road network operation state. The method comprises the following steps of A, identifying red-and-green sidesin the urban road network; B, digging red-and-green areas in the urban road network operation state; C, presenting a road network operation reliability index based on the red-and-green areas; and D, analyzing emerging and evolution characteristics of the red-and-green areas. For aiming at restrictions such as abstractness, static state, relatively low statistics property and relatively low stability in road network reliability management decision according to an existing road network operation state evaluation method, a concept of dynamic sub-picture connecting is introduced, and the red-and-green area identifying and evaluating method for the urban road network operation state is constructed. According to the method of the invention, the road network is divided into areas with different operation states; through analyzing the emerging and evolution characteristics, a manager can accurately master the real-time road network operation state for preparing a scientific and high-efficiencytraffic management solution. The red-and-green area identifying and evaluating method for the urban road network operation state has advantages of high wholeness, high stability, easy determining, wide application, etc.