Based on the principles of evaluation of formaldehyde content and release amount from wood-based panels, this paper systematically summarizes the previous researches on the correlation of formaldehyde detection methods on wood-based panels. Through the analysis of the formaldehyde release process from the wood-based panels, the functional relationship between the formaldehyde content of the panel and the formaldehyde concentration in the air environment was theoretically derived. According to the standard test parameters and the formaldehyde emission law of the panel, the function relationship is simplified, and the linear calculation equation was obtained from the climate chamber method, the perforation extraction method and the desiccator method, which provides theoretical support for establishing the correlation of formaldehyde detection methods for wood-based boards, and theoretical basis for the development and application of linear calculation equations.