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COVID-19 seriously threats human life and health.Our hands will inevitably touch some public goods in daily life, such as elevator buttons, door handles, etc, which may have viruses or bacteria on them. If we don't pay attention to hand hygiene, our hands may send viruses into our body through eyes,mouth, or other mucous membranes. Therefore, we must develop a good habit of hands washing for 20 seconds which is the least reaction time for virus and hand sanitizer.Washuntil combined three concepts of light,hourglass and motion of press to help people form a good washing habit by using an intersting way of timing for 20 seconds.