Production of casting involves various processes like pattern making, molding and assembly, core making and melting, etc. A casting defect may be a result of a single cause or a combination of causes. The single castings have one or more defects. These can be minimized by taking corrective actions in the tools like pattern, mold making, core making, and melting process. This paper presents a systematic procedure to identify as well as to analyze major casting defects. Keeping rejection to a bare minimum is essential to improve the yield and increase the effective capacity of the foundry unit and also improve productivity. This paper identifies the major cold defect. There are many reasons to generate these defects. So it preferably necessary to reduce it as much as possible by appropriate analysis of the defects which includes the root cause analysis so that actual reasons behind occurring the defects can find out to make the corrective action. In this paper use six sigma technique and Shainin tool for indentify and analysis casting defect. Shainin tool works on the elimination principle. The final result of this work has to be cold defect by taking corrective action. Tool should be identifying the sources of variation clearly.