The study is intended to study the difference of Temperature on the Productive Performance and certain Physiological Parameters in Laying Hens under Evaporation Cooling System in size 12 × 80 m Chicken cage in size 40 × 40 × 30 cm Per Laying Hens 4 a. Duration of trial performed all over a period of 8 weeks. using the t-test method (statistic of a statistical hypothesis test value-test) try using egg chicken breed of lohmann Hisex. female old 51 week and number 96 a. for chicken eggs are food and water as normal