The tomato ( Lycopersicon esculentum) is one of the most widely consumed fresh vegetables in the industrialized world. Tomatoes are a rich source of fibre, vitamin A, C, and lycopene and studies indicate that thy have an important role in human nutrition. On of the main limitations in the tomato trade, preservation and its export is the life after harvest and microbial spoilage will lead to a lot of waste. But by means of postharvest technologies we can control their decay to same extent. It seems edible coatings are good antibacterial resoueces to preserve ageicultural crops. Today, interest in the use of edible coatings biodegradable natural rather than synthetic waxes commercial for maintaining postharvest quality of products has increased. Edible coatings function as an effective semipermeable barrier to respiratory gases and water vapor between the fruit and the surrounding atmosphere, and can create a modified atmosphere, which delays senility. It can be potentially used for extending shelf-life and maintaining the quality of foods by preventing changes in aroma, taste, texture and appearance. It seems carboxymethyl cellulose (CMC) is a good resource to preserve agricultural crops. The current experiment was conducted to find the effect of carboxymethyl cellulose on postharvest life of tomato fruit cv. "HONEY". The first experiment was conducted to asses the age of storage life of tomato using treatments of carboxymethyl cellulose (1%,0/75%,0/5% 0/25%). After treatment, the fruits were presereved in a cold storage with 10 °C and 60-70% for 40 days. After that the fruits were taken out each 8 days and were assesed to determine parameters such as weight loss, firmness, pH titratable acid, soluble solids, vitamin C, Index taste, lycopene content, chilling injury and Total antioxidant. The second experiment to simulate shelf life of fruits coming out of cold storage was conducted, similar to the first experiment. The difference is that fruits after treatment were kept in cold storage for 30 days and then were stored for 6 days at room temperature and were tested at intervals of every 2 days. Both of experiments were performed as a split plot design in time in a complete randomized design with three replications. The results of the first experiment showed that CMC, has a significant effect on measured indexes. The results showed that The highest amount of firmness, titratable acid,, vitamin C and Total antioxidant and The lowest weight loss, Index taste, lycopene content, chilling injury compared to control groups treated with CMC 1% was observed that with CMC 0/75% showed no significant difference. The lowest soluble solids and pH recorded with CMC 1% that had no significant difference with two treatments 0/75% and0/5%. The results of the second experiment showed that CMC treatments, had a significant effect on all measured indexes. The results showed that The lowest weight loss, soluble solids, Index taste, lycopene content, chilling injury and The highest amount of firmness, titratable acid,, vitamin C and Total antioxidant compared to control groups treated with CMC 1% was observed which had significant difference with the other treatments. In the second experiment had the highest vitamin C content in treatments CMC1% that were had no significant difference with two treatments 0/75% and0/5%. Also The lowest amount of pH was recorded with CMC1% and CMC0/75% which they had no significant difference wiht each other. effect of time on all measured traits was significant in each of the two experiments. The reciprocal effect of treatment and time was significent in all charactristics. According to the result of this study, treated fruits with CMC%1 and CMC0/75% result in longer maintenance of qualititive features of fruits during storage period. Keywords : Tomato, Postharvest, Carboxymethyl Cellulose (CMC), Edible Coating