Two filed experemants were carried out at El- Sheak Zowid Research Station, North Sinai Governorate, during the tow growing seasons of 2004-2005 and 2005-2006 in sandy soil and drip irrigation system with saline water (3500 ppm ) the aim of study was to investigate the effect of compost application  at rates of (0,3,6 and 9 ton./fed.) and bio-fertilizer treatment (Azospirillum, Azotobacter and Bacillus megatherium) on growth, yield and chemical composition of three cultivars of carrot. Nantes cultivar had highest values in plant length, while, Chantnay surpassed in total plant weight, root and shoot weight and shoot : root ratio, but Japanese gave the largest root diameter and length. Compost application resulted in increasing growth parameters, the highest values were obtained with 6 ton /fed. Also, bio-fertilizer application increased growth characters.                 Nantes cultivar showed the highest values of yield, followed by cvs. Japanese and Chantenay respectively. Compost application at rat of 6 ton./fed. showed positive increasing in total and marketable yield. Also, bio-fertilizer treatment significantly total produced increased yield.               Chantenay cultivar had the highest content of K, Ca and carotene, but cv. Nantes showed significantly less content in Na and CL than Japanese cultivar, and the highest content of carbohydrates. Compost application at rat of 6 or 9 ton/fed. resulted significant increase in K and Ca content, also, the same rates increased carotene and carbohydrates content. On the other hand, application of 9 ton/fed. compost gave the lowest values of Na and CL content. Bio-fertilizers  treatment significantly increased the content of K, carotene and carbohydrates, but Na  and CL percentage was decreased in carrot with bio-fertilizer treatment under saline conditions.