In this study, polypropylene filter coated by titania sol and its disinfection characteristic was performed in Escherichia coli and Staphylococcus aureus. As the results, in case of polypropylene filter coated with titania sol, the deodorization efficacy was 66%, 90% and 16% for ammonia, trimethylamine and acetic acid cause indoor air pollution. Also, the disinfection activity for Escherichia coli and Staphylococcus aureus was showed superior character 99.9% after 24 hours. From these results, ammonia, trimethylamine and acetic acid can effectively be removinf by polypropylene filter coated by titania sol prepared in this study. In addition, this darkcatalysis was found to give a very high efficiency for disinfection of Escherichia coli and Staphylococcus aureus.