Effect of Kaolin spray on physiological development and quality fruit was studied. To studied the effects of Spraying Kaolin clay on physiological changes and quality fruit in Melon and effects of Leaf surface temperature changes, Photosynthesis, the green value of leaves, the nutrient content in the leaves. The experimental design was Factorial in RCBD (4X3) 4 replications has 2 factor, Factor A the Kaolin clay sprayed the concentration 0 40 60 and 80 grams per 1 liter , spray 1 time per week for four times. Factor B sprayed at 14 28 and 42 days after transplantation. The results showed that the factor A and B did not effect on plant height and leaves number. The sprayed at 28 days after transplantation had fruit length higher than 14 and 42 days after transplantation at 5 week after flower anthesis. The 40 grams per 1 liter was lower leaf temperature.