The residual behaviour of tetraconazole and indoxacarb pesticides on and in tomato fruits was studied under the environmental condition of Egypt. Residue analysis showed that the initial deposits of tetraconazole and indoxacarb in unwashed tomato fruits were 12.664 and 9.52 ppm. respectively .These figures decreased to 0.98 and0.02 ppm after 28 and 21 days after treatment of tetraconazole and indoxacarb, respectively. Also results showed that the washing process by tap water of initial time dissipated 54.14 and 45.86 % oftetraconazole and indoxacarb,respectively from tomato fruits. 0n the other hand. the effect of temperatures, UV-rays and direct sunlight on tetraconazole and indoxacarb degradation were studied. The data showed that sunlight more effective than UV-rays in degradation of tetraconazole and indoxacarb. Tetraconazole and indoxacarb were reduced after 24 hours of exposure to direct sunlight by 89.74 and 88.7%. respectively. While 24 hours exposure to UV-rays reduced 45.38 and 57.7% for tetraconazole and indoxacarb, respectively. Also results obtained that tetraconazole and indoxacarb showed a high degradation rate when exposure to high degrees of temperature 45-50°C within the period of experiment.