With PAANa and sepiolite as absorbent materials, styrene-acrylic emulsion as base material, TiO2 as paint and CaCO3 as filler, prepared sixteen samples of inorganic polymer composite humidity-controlling coatings through orthogonal experimental design and tested the samples' humidity-controlling performance, compared the humidity-controlling properties of the samples, and obtained the best formulation ratio of the humidity-controlling performance for the coatings.