The invention relates to a method for monitoring the control state of the bottleneck. The method comprises steps of: obtaining data of all of the intersections in the bottleneck control sub-area and adjacent intersections; selecting an intersection as a central intersection, and then displaying an interface, which comprises the intersection and other five intersections in the east, west, south andnorth, in a graphical form, wherein each intersection contains four directions of east, west, south, and north; displaying the phase lamp state in real-time, a phase flow, the release time of the phase in one cycle, the change amount of the release time of the phase in the cycle and the upper cycle, the occupancy rate of the road segment detector, and the occupancy rate of the overflow detector on the graphical intersection; controlling the phase release of the upstream and downstream intersections by modifying thresholds, according to the values of the occupancy rate of the road segment detector and the occupancy rate of the overflow detector. According to the method for monitoring the control state of the bottleneck, the method is easy to realize, is high in efficiency, is rich in display data, is capable of controlling the release state of the intersections, integrates the display and the control, and can be integrated into an actual road traffic control system.