This study aims to suggest an appropriate management plan for flammable liquid waste discharged at higher rates compared to other designated wastes. GC/MS analysis of waste organic solvents was conducted to confirm the types and contents of solvents. Hazardous properties such as flammability, explosiveness, spontaneous ignition, corrosiveness, and reactivity with water were also investigated. Through GC/MS analysis of 21 samples of organic solvents, six kinds of organic solvents were mainly detected, namely methylethylketone, ethylbenzene, phenol, acetone, 1,4-dioxane, and 1, 2-dichloroethylene. In addition, it was found that nine of the examined samples were flammable, without additional hazardous properties. Therefore, this study calls for the necessity to examine waste organic solvents through GC/MS and assess their flammability and other hazardous characteristics.