Southern corn rust,caused by Puccinia polysora Underw.,mainly distributes around tropical and subtropical areas.It is getting more and more wide-spread along with the global warming and its influence on corn production is getting bigger and bigger.Determination of temperature required by southern corn rust can be very useful for mapping its distribution and preventing the disease.By inoculating and incubating P.polysora on the corn varietyZhengdan958under different temperatures in illumination incubators,we found that the temperature required by southern corn rust was 15-31℃,and the optimal temperature was 24-27℃.