The principle of coordination is the harmony and unity between the indicator oriented system and the environment it serves in terms of atmosphere, color, style, proportion, etc. The signage guidance system is a bridge between people and the environment, and it is also a part of an entity in the environment. Therefore, under the premise of satisfying its functionality, it is no longer a completely independent entity, but a part of the overall environment.

Complex factors such as environmental nature, characteristics and style should be fully considered in the design and positioning stage of the signage guidance system. Signage guidance system is a way of communication between people and the environment, which forms a series of visual perception in a certain space to ensure that people in the environment can receive enough visual information smoothly. It can be said that when people are in a certain environment, the first thing to enter their visual perception is the sign orientation system. Therefore, the signage guidance system should not only meet the intuitive functions of conveying directional information and guiding information, but also convey the nature and style of the environment to people through its own characteristics, tone and other visual elements, helping the overall environment to create a specific main atmosphere.

Of course, the coordination between the sign guidance system and the environment is not to sacrifice its function in order to integrate with the surrounding environment, if the sign guidance system is submerged in the complex visual elements of the environment, it will lose the function and significance of the sign guidance system to convey the most basic indicative, explanatory, and reminder information. The most important principle of sign-oriented system planning and design is its functionality, and the principle of coordination should be extended on the basis of meeting its basic functions. The coordination of the sign guidance system and the environment is relative to its visual independence, which should be compatible with the environmental background and be able to have a distinct visual effect. This requires that the signage guidance system should be designed according to the environmental background to choose the appropriate visual effects, which should be able to highlight the functional subject without damaging the overall atmosphere of the environment.