Abstract: The author used the method of climate inclination rate, the relative variability of precipitation and the division of base years to study the variable precipitation characteristics of each growth period and the growing season of corn in recent 60 years in Chaoyang area. The results showed that the climate inclination rate of precipitation of corn growing season in recent 60 years was -6.55 mm/10 a, presented a downward trend. The precipitation variation trend of different corn growth periods was different, the precipitation in corn planting-seedling stage and mature period showed an increasing trend, the climate inclination rates were 4.2 mm/10 a and 0.3 mm/10 a, respectively. The precipitation in jointing-booting stage presented a downward trend, the climate inclination rate was -10.6 mm/10 a. The precipitation variation trend in different base years had significant difference. The second base year precipitation decreased most obviously, climate inclination rate reached -23.7 mm/10 a. The third base year precipitation increased obviously, climate inclination rate reached 29.0 mm/10 a. The precipitation relative variability of corn growing season and each development period in Chaoyang was great, years of deficient precipitation accounted for the most, years of normal precipitation accounted for the least. The research results provided climatic evidence for variety selection, improvement of cultivation pattern as well as disaster prevention in corn production in this area.