Abstract: In order to clarify the phenological phases and responses to the different altitudes of Dipentodon sinicus in Wumeng Mountains Reserve, nine phenological monitoring sites were set up with a gradient of 100 m in the distribution range of D. sinicus in the Reserve, and the phenological periods were monitored for three consecutive years. The results showed that: (1) The leaf bud opening (germination) period of D. sinicus in Wumeng Mountains Reserve was March, leaf unfolding period was from mid-March to late April, flower bud opening period was from mid-March to early May, flowering period was from mid-April to late May, flower falling period was from late April to early June, fruit period was from early May to mid-September, leaf discoloration period was from early July to mid-December, and the leaf falling period was from late August to mid-December. The dormant period was from mid-December to March of the following year. (2) The phenological initial time of flower bud opening (leaf buds and flower buds), leaf spreading, flowering, flower falling, fruiting and leaf falling were all positively correlated with the altitude changes, and flower falling （P=0.000） and fruiting （P=0.003） were highly significantly positively correlated; leaf bud opening （P=0.015）, leaf spreading （P=0.026）, flower bud opening （P=0.012） and leaf falling （P=0.045） showed a significantly positive correlation; flowering （P=0.128）was not significantly correlated with the altitude, but leaf discoloration （P=0.01） showed a highly significantly negative correlation with the altitude. (3) The phenological durations of leaf bud opening, leaf spreading, flower bud opening, flowering and leaf discoloration were positively correlated with the altitude, leaf spreading （P=0.002）reaching a very significantly positive correlation, leaf bud opening （P=0.048）and flower bud opening （P=0.017）achieving a significant positive correlation, flowering （P=0.126） not coming to a significant positive correlation. The durations of flower falling （P=0.649）, fruit period （P=0.004） and leaf falling （P=0.003）were negatively correlated with the altitude in various degrees. (4) The best ornamental periods were the flowering period from late April to late May and the leaf discoloration period from October to November. In terms of temporal dynamics, the phenology of D. sinicus has no obvious regularity. This paper preliminarily finds out the phenological phases and their responses to the altitude in Wumeng Mountains Reserve, providing data support for the protection measures, development and utilization, breeding and community safety of the Reserve.