The purpose of this research was to study behavioral problems of 3-5 years old children and the successful solutions that caregivers used in childcare centers under Local Administrative Organization. The samples were 4,147 caregivers. The research instrument used in this study was a questionnaire concerning children behavioral problems and solutions of caregivers. Content analysis and percentage were used to analyze the data. The research findings were as follows: 1. Children behavioral problems found in classroom could be categorized into 6 groups. The highest frequency of the behavioral problems found in each group were: (1) being aggressive 24.31 %; (2) making a loud noise 56.46%; (3) throwing obj ects 27.72%; (4) being addicted to baby bottle 20.22%; (5) refusing to take a nap 35.57%; and (6) refusing to have lunch 31.83%. 2. Solutions that caregivers used successfully could also be categorized into 6 groups. The highest frequency solutions in each group were: (1) setting rules, asking for cooperation and praising them for appropriate perfonnance 27 .27%; (2) speaking with them softly 53.74%; (3) no suggestions in dealing with this group of behavioral problems; (4) asking children to leave their bottles with the caregivers 16.94%; (5) encouraging all of them to sleep during nap time 31.40%; and (6) explaining them the results of not eating and complementing those who eat 23.51 %. Solutions that caregivers mostly used in each sub-group as mentioned were: setting rules, encouraging and praising them when they perform; telling a story concerning the incident; separating the children from the circumstances; reminding and explaining them what was inappropriate; and setting helpful activities for them to join with.