Laboratory studies on the temperature-dependent development of Tuta absoluta were performed at 10 constant temperatures ranging as from 15 to 34 ± 1°C. The duration of total development was measured for every temperature. Tayfun F1 tomato variety was used for larval feeding ve all experiments were done at climatic cabinets where had long daylight period (16:8) and 65% ± 5 constant humidity conditions for every temperature. According to obtained data, developmental zero () and thermal constant () were calculated by using linear regression and lower (), optimum () and upper () temperature thresholds for total developmental period of pest were calculated by using Polynomial ( 4 th ), Logan 6, Logan 10, Lactin 1, Briere 1 nonlinear regresyon models. Development time decreased with increasing temperature within the range 15-29 °C ranging from 78.17 days to 21.39 days. Zero developmental threshold for total development of Tuta absoluta was estimated as 8.94 °C and thermal constant was found as 419.46 degree-days. And lower, optimum and upper temperature requests were estimated with different models and results ranging from 8.9-12.5, 31.00-31.07 and 35.9-38.5, respectively.