Abstract: In order to reflect the impact of climate warming on season changes in Linyi, so as to give a better service to the local seasonal agricultural production, disaster prevention and mitigation, using the daily temperature data in Linyi from 1962 to 2013, the start dates and lengths of four-season in recent 52 years in Linyi were analyzed according to the national standard of climatic season division. The results showed that spring started earlier obviously while autumn and winter started later in varying degrees, which was most obvious in the 1990s and the beginning of the 21st century, the trend of summer start date was not significant. Studies over the four- season length showed that the length of spring and summer had a slightly increasing trend while that of winter showed an obviously shortening trend. The mutation of four-season length mostly occurred in the late 1980s to early 1990s, and after 1980s the length of spring and summer showed an increasing trend while that of winter had a continuously shortening trend, especially after 1998. The fourseason length all had a cycle of 3 years, 6 years and 9 years, and the 3 years cycle was most obvious in spring while 6 years cycle was most obvious in summer, autumn and winter. In addition, there was a cycle of 12 years In order to reflect the impact of climate warming on season changes in Linyi, so as to give a better service to the local seasonal agricultural production, disaster prevention and mitigation, using the daily temperature data in Linyi from 1962 to 2013, the start dates and lengths of four-season in recent 52 years in Linyi were analyzed according to the national standard of climatic season division. The results showed that spring started earlier obviously while autumn and winter started later in varying degrees, which was most obvious in the 1990s and the beginning of the 21st century, the trend of summer start date was not significant. Studies over the four- season length showed that the length of spring and summer had a slightly increasing trend while that of winter showed an obviously shortening trend. The mutation of four-season length mostly occurred in the late 1980s to early 1990s, and after 1980s the length of spring and summer showed an increasing trend while that of winter had a continuously shortening trend, especially after 1998. The fourseason length all had a cycle of 3 years, 6 years and 9 years, and the 3 years cycle was most obvious in spring while 6 years cycle was most obvious in summer, autumn and winter. In addition, there was a cycle of 12 years