After comparing the climate data of 1984 to 2014 in Guilin with local citrus growth cycle data for the same period, with the application of the linear trend estimation, correlation coefficients of SPSS and other methods, the characteristics of Guilin’s climate warming and its impact on the phenological phase of local citrus are studied. The results shows that the warming trend in Guilin in 31 years was obvious, with the following main features: the annual average temperature rose by about 04 ℃; the climate in the late 1990s and early 2000s heated up significantly, with the main and the most significant warming in spring and winter, slight warming in summer and fall. On the other hand, the change of local citrus’s phenological phase caused by climate warming was marked, thus spring phenological phase came in advance while autumn phenological phase delayed, contributing to a trend of growing season being extended. In addition, temperature is the most distinctive meteorological factor that impacts the local citrus’s phenological phase greatly. February average maximum temperature increased by 1 ℃; therefore, orange buds opened in advance about 3 to 4 days; the March average maximum temperature increased by 1 ℃, so the flowering period came in advance about 4 to 9 days; because the annual extreme maximum temperature increased by 1 ℃, the maturity postponed 68 days.