Plant phenology has become the focus of global climate change research as a sensitive indicator. Based on climate data from 1959 to 2017 and phenological observation data from 1983 to 2017 in meteorological experiment station of Ewenki, which is located in typical grassland area, the climate change characteristic and change trend of reviving, blossoming, withering, and growing season of Stipa grandis and Leymus chinensis (Trin.) Tzvel. were analyzed. The results showed that: (1) In the past 60 years, the average temperature in Ewenki has shown a very significant fluctuation and increasing trend, and the change of annual precipitation and annual sunshine hours is very small. (2) The reviving dates for Stipa grandis and Leymus chinensis (Trin.) showed a delay trend with the trend rate of 2.2 d/10a and 1.4 d/a, respectively. The blossoming stage was not change obviously. The withering dates advanced in 2.8 d/10a and 1.5 d/10a, respectively. The growing season presented tendency of shortening. (3) The temperature in March and April was the most important climate factor which affected the turning green in this study area, the rising temperature accelerated the turning green. The precipitation of two months before had great influence on blossoming dates. The rising temperature led to the advance of withering, while the increasing precipitation delayed withering dates.