This study looks at how the main phenological stages of Fuji apples (Malus domestica) are spread out over time and space in China, with a focus on how environmental elements like temperature, sunshine hours, and humidity affect them. The goal of the study is to find trends in the timing of important growth stages in different apple-growing areas of China, such as bud break, flowering, fruit set, and ripening. Data from many places over a number of years demonstrate that these stages change a lot based on the climate in each place. In warmer places like the North China Plain, phenological occurrences happen earlier. In cooler places like the Loess Plateau, they happen later. The report also talks about how climate change is affecting us, especially the rising temperatures and more extreme weather events that happen more often. These changes have produced alterations in the timing of phenological events. For example, warmer spring temperatures have prompted buds to break and flowers to bloom sooner, which may not be in line with when pollinators are available. Also, warmer temperatures in the fall can speed up the ripening of fruit, which could make it less tasty and less likely to sell. The correlation study shows that temperature and sunlight have moderate effects on each other, both of which are important for apple growth. The effect of humidity is less clear. We employed machine learning methods like Random Forest and Support Vector Machines to guess when phenological stage...