Traditional filters face limitations in improving formaldehyde CADR (Clean Air Delivery Rate) performance due to air resistance and structural limitations. We overcome this problem by adding a unique formaldehyde reducing agent to the surface of the fiber substrate. This agent can effectively decompose formaldehyde molecules into harmless carbon dioxide and water. Compared with traditional activated carbon filters that absorb formaldehyde, our formaldehyde composite filter paper has higher activity, better durability, and no secondary odor. Effectively enhance the FCADR performance of the filter.