This paper carried out to study of factors influencing on trout production in Khorasan Razavi province using a cross sectional data of 105 trout producers and estimation of trout production function in 2008. Results showed that farms\' area, number of fry, feed, fish farming period and water flow have positive effect on trout production and water temperature and fish losses have negative effect on it. Farms area, water temperature degree, number of fry, feed, fish farming period, water flow, water source, labor and fish losses elasticities are 0.282, -1.428, 0.216, 0.422, 1.641, 0.430, -9.19×10-4 , -1.407 and -0.157, respectively. The highest positive effect is due to fish farming period that shows trout producers harvest earlier of economic harvesting time and supply to market. The highest negative effect is due to water temperature that shows it is high. Use of farms\' area, number of fry, water flow and feed are at stage 2. Water temperature and fish losses are at stage 3. Effect of Farms area, water temperature degree, number of fry, feed, fish farming period, water flow, water source, labor and fish losses on fish production are 15.46, -78.30, 11.85, 23.14, 89.99, 23.58, -5×10-2, -77.15 and-8.60 kg, respectively. Fish cost price is 23518.16 rial kg-1 that sale 30000 rial kg-1 at market. Cost, revenue and gross revenue of trout estimated 49.13, 62.67, 13.54 rial day-1fish-1, respectively. Gross margin (income) is 6481.84 rial kg-1. Regard to results, fish feed management, supplying of farms water from river and spring, try to decrease of water temperature to 15-16oc, fish harvesting in income maximization time and farm environmental management suggested.

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