In this study, the effect of Cooking and pre-Cooking methods was done on quality and sensory factors of peeled and un peeled whiteleg western shrimp. Free fatty acids, pH indices, TBARs, volatile nitrogen bubbles (TVB-N) and sensory factors such as tissue, Odor, taste were evaluated during 16 days of storage at-18 °,C. Cooking and pre-Cooking of shrimp were done by boiling, in which the shrimp was heated to 80 °,C for 5 minutes to Cooking and 3 minutes to pre-Cooking. According to the results, the lowest and the highest amounts of Thiobarbituric acid in peeled shrimp (1. 57 ±,0. 05) and Cooking unpeeled shrimp (2. 19 ±,0. 01) were significant (P <0. 05), for the pH of the Raw treatment peeled shrimp (6. 66 ±,0. 03) and Cooking unpeeled shrimp (7. 50 ±,0. 04) were significantly different (P <0. 05), for TVB-N index, crude treatment with skin (23. 10 ±,1. 21) and cookking unpeeled shrimp (33. 50 ±,0. 97) with a significant difference (P <0. 05) and for the FFA index, treatment unpeeled cookinng (1. 54 ±,0. 01) and raw without skin (1. 97 ±,0. 07) with a significant difference (P <0. 05). The study of sensory indices showed that heating would maintain the quality indices during the maintenance period