A natural bio-deodorant was made using pine cone byproduct and microbes, and its efficiency of deodorizationand effects on composting progress were evaluated in this research. The natural bio-deodorant was manufacturedby mixing the pine cone byproduct with molasses containing mineral water and three microbes (Lactobacillus spp.,Alcaligenes spp., Pasteurella spp.), and then incubating at 30℃ for 48 hrs. Usage of the bio-deodorant did not inhibitcomposting and reduced the production of malodor such as H₂S, CH₃SH, and NH₃ gases. Although reductionof malodor was observed when pine cone byproduct was solely used, inhibition of composting was found inthis case. The bio-deodorant induced active decomposition of organic matter during composting and conservednitrogen by lowering the emission of ammonia.