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This experiment was carried out to study the effect of sodium cnloride from drinking water and feed on performance of laying hens. Four hundred and twenty native and white Leghorn laying hens from 36 to 43 weeks of age were used. Seven experimental treatments containing different levels of salt which was supplied by feed and/or drinking water were compared. Increasing salt intake by drinking water or feed caused no reduction in egg production, egg output, daily feed intake, feed conversion ratio and Haugh unit. Addition of salt to the drinking water increased egg wight. Shell thickness was reduced by the addition of salt to the drinking water. Correlation between increasing water salt content and shell thickness was significant. Reduction or elimination of dietary salt caused no improvement in shell thickness of eggs laid by hens consumed saline drinking water. Reduction in shell thickness was not related to the reduction in feed intake or increases in egg output