Countering the issues of frequent dusty weather in spring and insufficient greenhouse indoor light in southern Xinjiang，this study took ‘NS3389’ tomato as test material and LEDs as supplemental lightning sources to study the effects of 3 treatments on leaf photosynthetic behavior during the period at 6：00 to 22：00 local time．Using lower light intensity of 100 μmol · m^-2 · s^-1 as T1；relatively higher 200 μmol · m^-2 · s^-1 both before opening the curtain and closing it as T2；and self-supplementary lightning with 100 μmol · m^-2 · s^-1 after uncovering the greenhouse when the indoor light intensity was lower than 150 μmol · m^-2 · s^-1 as T3．The results showed that supplementary lightning treatment could effectively improve the photosynthetic performance and self-protection ability of tomato leaves．T1 has the highest net photosynthetic rate（P_n），improving the leaf photosynthesis by alleviating the stomatal limitation factor．Monitoring the carbon sequestration effect of functional leaves under different treatments，the results showed that the photosynthetic products of T1 and T2 for forming dry matter in fruits accounted for higher proportion in each leaf，and the attenuation range away from the fruit was smaller，meaning a better carbon fixation effect．The supplementary lightning treatment could significantly promote tomato plant growth，shorten anthesis time，and enhance the fruit yield．Economic analysis showed that both T1 and T2 had higher economic benefit and could be used as an effective supplementary lightning model for facility tomato production in southern Xinjiang．