Reproduction and population parameters of vegetable leafminer,Liriomyza sativae Blanchard were measured on cucumber (Cucumis sativus L.) at seven constant temperatures (10,15,20,25,30,35 and 40℃). No eggs were found at 10℃ and flies died after exposure to 40℃. The significantly highest intrinsic rate of natural increase (rm),net reproductive rate (R0) and finite rate of increase (λ) of L. Sativae were obtained at 25℃ as 0.196,52.452,and 1.216,respectively. The above-mentioned parameters decreased at 15℃ and 35℃ and this reduction at 35℃ was strong. Doubling time (DT) varied significantly with temperature. The shortest doubling time was obtained at 25℃. Mean generation time (T)decreased significantly with increasing temperature between 15℃ and 35℃. Percentage of immature ages in the stable age distribution was more than 95% at all temperatures. Female longevity was greater than male at all temperatures. Liriomyza sativae lived for a long time at 15℃,whereas at 35℃ had lower survival rates. The effect of temperature on reproduction,especially the intrinsic rate of increase of L. Sativae would be useful for predicting its longterm population fluctuation over several generations.