The present study aimed to investigate and compares the pattern of Code Mixing in Sequential bilingual young adult. Thirty Sequential bilingual (Tamil-English) adults between the age range of 18-25 years were participated in this study. The bilingual participants were asked to describe the cookie-theft picture in Tamil. The patterns of Code Mixing (Intra Sentential Mixing and Intra Lexical Mixing) were analysed from the collected data. The results showed sequential bilingual adult uses 4.8% of Intra Sentential Mixing and 5.3% of Intra Lexical Mixing. In pattern of Code Mixing, Intra Sentential Mixing found to more in women. The present study concluded that Sequential bilingual speaker uses slightly higher percentage of Intra Lexical Mixing when compared to Intra Sentential Mixing in the picture description task. This finding will help Speech Language Pathologist to plan assessment, intervention and to development appropriate material for Sequential bilingual speakers in making clinical decision.