A method was developed for the qualitative and quantitative analysis of DINCH in plastics by GC-MS.The key fragmentation processes of the mass spectrum were elucidated based on the mass spectrum theory,and the fragmentation experiment of these ions could provide theoretical knowledge for the rapid identification of the existence or not of DINCH in plastics.Based on the comparison of extraction efficiencies of different organic solvents,dichloromethane was used as extraction solvent in the method.The test result showed that the method had a good linear relationship（r=0.998）in the range of 0.24-1.60 mg/L.The limit of quantitation（LOQ,S/N=10） was 1.2 mg/kg.At spiked levels of 80-400 mg/kg in plastics（PE,PP,PU,PVC）,the average recoveries were in the range of 82%-113%,with relative standard deviations of 1.1%-9.0%.The method was applied in the determination of DINCH in plastics samples with satisfactory results.