Abstract: The leaf area index （LAI） serves as an important parameter for investigating the global carbon cycle，water cycle，energy exchange，and climate change. At present，there are multiple LAI products with different time series and resolutions. Comparative analysis of these products can not only reveal their suitability in various regions，but also provide suggestions for optimizing their algorithms. Focusing on the typical areas in Anhui province，this study compared and assessed the spatiotemporal consistency of MuSyQ LAI，MODIS LAI，and GLASS LAI products from the perspective of their capacity to characterize the spatiotemporal characteristics of vegetation. The results indicate that the spatial distribution of LAI obtained from the three products was consistent with the spatial distribution of vegetation，revealing good spatial consistency. However，there existed differences in LAI values and spatial heterogeneity. To be specific，the MODIS LAI displayed generally higher values than the other two products. The MuSyQ LAI exhibited lower values than the GLASS LAI in cultivated land and deciduous broad-leaved forests，but higher values in evergreen forests. As spatial resolution increases，the three products all showed better spatial details，with the MuSyQ LAI featuring the most pronounced spatial heterogeneity in land cover distribution. As the elevation varies，the MODIS LAI and GLASS LAI values vary in a consistent pattern，while the MuSyQ LAI value varies in a different pattern. The three products presented altitude-varying LAI values at low-altitude areas，whereas they showed varying change patterns at high-altitude areas across different sample areas. Temporally，the three products presented relatively complete time-series curves of the annual average LAI value over the years and similar seasonal trends，which can effectively characterize the phenological characteristics of crops and the seasonal variations of different plants. Overall，the three products exhibited good spatiotemporal consistency，all of which can reflect the spatial distribution and temporal changes of vegetation. However，they were different in the LAI value and spatial heterogeneity. Among them，the MuSyQ LAI is more suitable for investigating inter-annual changes in areas featuring complex terrains and high heterogeneity in land cover distribution，while the GLASS LAI is more suitable for long-time-series studies in large areas.