Abstract: We conducted tests on the Hani terraced rice ‘Yuelianggu’ in order to study the effect of nitrogen on canopy day temperature, photosynthetic active radiation interception rate and rice blast, and to explore the relationship between canopy photosynthetic active radiation interception rate and rice blast, then construct the health canopy structure. The experiment consisted of six treatments, which were five different nitrogen levels and a traditional fertilization management, and carried out as a random block design experiment in field. The results showed that rice canopy day temperature reached the minimum at heading stage at the highest level of nitrogen conditions (125.0 kg/hm²), then the maximum interception ratio of canopy photosynthetic active radiation reached the maximum. The disease index of neck blast reached the maximum at medium (75.0 kg/hm²) and high level of nitrogen conditions (P＞0.05), and morbidity reached the maximum at medium level of nitrogen conditions. The morbidity, disease index and the maximum interception ratio of canopy photosynthetic active radiation had a positive correlation, and the correlation coefficients were 0.6696^* and 0.7130^**. Morbidity had a positive correlation with level 1 of diseased panicle proportion (r=0.7511^**), but had no relationship with level 2 to level 5 of diseased panicle proportion. Disease index had a positive correlation with level 5 and level 1 of diseased panicle proportion, and the correlation coefficients were 0.6324^** and 0.4936^*, respectively, but had no relationship with level 2 to level 4 of diseased panicle proportion.