Safety work is divided into preschool (kindergarten), middle school (primary school 1-3 grade), middle school (primary school grade 4-6) and high school (junior high school and senior high school). There are four specific contents of online safety work during each study period, namely, anonymous questionnaire survey before study; Watch short videos of safety skills according to the learning cycle, including drowning prevention and sexual assault prevention; Safety knowledge test, using questionnaire survey. ...