The purpose of this study was to examine ethical dilemmas school social workers in secondary schools encountered and the bases they used to resolve the dilemmas. Interview methods were conducted to collect data from fourteen school social workers who were on site and circuital. Grounded Theory was used to guide the analysis using the WinMAX software. Three types of ethical dilemmas were found: Value dilemmas, obligation dilemmas and structural dilemmas. Four bases were used in the deliberation process: Legal, ethical, effectiveness, and value.