Abstract: Before biochar is widely used, more attention should be paid to the problem of biochar application resulting in a change of surface albedo of the farmland, which is likely to lead to changes of soil temperature and moisture, further influencing the bioactivity and respiration of the soil. Based on this background, a field experiment was conducted in the present study to characterize seasonal changes in albedo on farmland both with plants and without plants, and its effect on soil temperature and humidity. The experiment included three treatments:the blank control group (CK), and biochar applied at 0.5 kg/(m²·a) (BC5) and 4.5 kg/(m²·a) (BC45), with three replications for each one. Each treatment was attached to two sub-treatments, which were crop cultivation (+) and non-cultivation (-). The results showed that under the condition of corn planting, the albedo of BC45+ and BC5+ decreased by 23.1% and 19.1% (P＜0.05) respectively in the maize seedling. The albedo decreased by 20.0% and 15.1% (P＜0.05) in the jointing stage, but from the heading stage to mature stage, the surface albedo of each treatment showed no significant differences, and the temperature and moisture of soil were not significantly changed with respect to CK+. Under the condition of non-cultivation, the albedo of BC45- and BC5- decreased by 26.7% and 24.3%, respectively (P＜0.05). The soil moisture of BC5- increased by 1.7%-3.8%, while the soil temperature and moisture of BC45- showed no significant changes compared with CK-. With the development of maize canopy structures, the decrease of surface albedo caused by the input of biochar weakened or even disappeared. The effects of biochar input on soil temperature and soil moisture are related to the maize canopy structure and the addition amount of biochar.