The specification of the reinforcement spacing of the square column buckle needs to be determined based on a variety of factors, including but not limited to the purpose of the building, design requirements, seismic intensity, and the height and width of the building. Here are some specific guidelines:

The ground clearance of the installation position of the square column buckle: it is generally recommended to be 20-30 cm (cm), which is to ensure that the wedge iron of the square column buckle can be tightened, so as to ensure the reinforcement effect of the building template. 
The effect of square column diameter: For square columns of different diameters, the reinforcement spacing will be different. For example, for a square column with a diameter of 800 mm (mm), the spacing at the bottom is usually set to 20cm, while the upper three lines are set to 30cm; The three above are set to 40cm, and so on. For a square column with a diameter of 600mm, the spacing at the bottom can be set to 20cm, the upper three channels can be set to 50cm, and the upper three channels can be set to 60cm. 
Other factors: In addition to the above factors directly related to the square column buckle, factors such as seismic intensity, building height and width, and concrete strength need to be considered. The higher the seismic intensity, the smaller the reinforcement spacing of the square column buckle, so as to improve the seismic performance of the building. Similarly, when the height and width of the building are larger, the reinforcement spacing should also be reduced accordingly. 
Specification standard: According to China's "Code for Design of Concrete Structure", there are detailed provisions on the reinforcement spacing of square column buckle, but in practical application, it needs to be adjusted according to the specific situation.
To sum up, the determination of the reinforcement spacing of the square column buckle is a comprehensive process, involving multiple factors, and needs to be determined according to specific engineering requirements and specifications.