Abstract: The paper aims to reveal the evolvement rule and characteristics of the daily range of temperature in Shouguang. According to the daily maximum and minimum temperature data in Shouguang from 1959 to 2014, by using methods of linear tendency estimation, cumulative anomaly, Mann-Kendall and noise-signal ratio etc., the variation characteristics of the daily range of temperature in recent 56 years were statistically analyzed. The results showed that: the annual average daily range of temperature in Shouguang significantly decreased by 0.38℃/10 a; the decadal maximum value of daily range of temperature appeared in 1960s, while the minimum value appeared in 2000s; the daily range of temperature in spring was the maximum, while that in summer was the minimum; the daily range of temperature in each season significantly decreased, and the winter had the most significant change, and the variation range of temperature in summer was the minimum; the daily range of temperature was the maximum in May and the minimum in August, the trend was a decreasing one; a significant mutation of the annual daily range of temperature with a decrease occurred in 1998, the anomalies of daily range of temperature of spring, summer, autumn and winter were in 1981, 1988, 1993 and 1992, respectively.