The second order reaction rate constant for the reaction of salicylaldehyde with aniline have been reported in ethanol in the temperature range 303 to 318 k .The rate of reaction is first order with respect to salicylaldehyde and first order with respect to aniline. Increase in temperature increases the rate of reaction. The thermodynamic parameters are used to explain the nature of reaction .Suitable reaction mechanism has been suggested for the formation of the Schiff base.