Cocamidopropyl Betaine (CAPB) is widely used in many field. Because CAPB having superior cleaning availability is not irritating to eyes and skin. The object of this research is to improve the foamability of the spray type disinfectant. About dilute aqueous solution of CAPB, the foamability was measured by Ross-Miles method. In the case of 0.1 wt% aqueous solution, the initial foam height was about 160 mm and about 140 mm after 5 minute. And the addition effect of EtOH was tested. As a result, ethanolic solution of CAPB was increased the foam height to 177-184 mm.