Effect of low temperature stress on photosynthetic characteristics and total output weight of maize was studied in the paper. Low temperature treatments were carried out in the artificial climate chamber using maize variety Zhengdan958 as experimental material. Under different low temperatures(13℃, 15℃and 17℃) and different treatment times(1 d, 2 d, 3 d, 4 d and 5 d), the changes of photosynthetic characteristics and grain weights were evaluated at four developmental stages such as tasseling, silking, polli...