基于遥感技术提出利用植被绿化面积、水体面积和景观格局等因素的时空变化对比评价方法，通过对高分遥感影像数据校正、融合、镶嵌和解译，计算植被指数、水体指数和景观格局指数变化，客观反映生态环境保护修复的时空变化情况，并且成本低，时效性强。基于大运河核心监控区北京段的试验表明：研究区内2015—2017年植被绿化面积减少，水体面积增加；2017—2019年植被绿化面积骤增，水体面积增加。从总体上看，植被绿化面积和水体面积均呈扩张趋势，景观格局趋于均匀化、规则化。在一定程度上体现了河长制推行下，大运河治理颇有成效，依此作为督察评估河长工作成效的数据支撑和依据，可量化，更具有客观性，是一种可行的方法。

The Grand Canal is an important cultural heritage in China,which has important economic,ecological and cultural significance.With the development and utilization of water resources,water pollution is becoming a serious issue.Government at all levels implement the river chief system to ensure the sustainable development of water resources and promote the protection and inheritance of the Grand Canal.Therefore,remote sensing information technology is applied to the investigation and evaluation stage of the river head system to monitor the temporal and spatial changes of the river basin. With the support of remote sensing and geographic information system technology,based on Gaofen-2 remote sensing image,the change of water body and vegetation coverage in the core monitoring area of the Grand Canal from 2015 to 2019 was analyzed.First,the two types of land use,water,and vegetation are extracted and the change of area in the time interval is analyzed.Then,according to the high-resolution image of Google Earth,validation samples are generated to verify the accuracy,and the classification accuracy meets the research requirements.Finally,the landscape pattern index was used to analyze the changing trend of each landscape in the study area.From 2015 to 2017,the vegetation area decreased by 82.94 km2,accounting for 38.82% of the original area,and the water area decreased by 0.01 km2.From 2017 to 2019,the vegetation area increased by 205.53 km2,accounting for 157.27% of the originalarea,and the water area increased by 1.79 km2,accounting for 10.86% of the original area.The total number of plaques first increased and then decreased,and the patch density fluctuated greatly.Edge density,aggregation degree,weighted average shape index also showed an upward trend.On the whole,the establishment of the construction team of the Grand Canal cultural belt and the river chief system by the staff of Beijing Municipality has achieved good results in the strict control of the water quality and the greening along the Grand Canal. The qualitative and quantitative evaluation of the comprehensive treatment results of the Beijing section of the Grand Canal is realized,and the actual situation of the study area is directly reflected through remote sensing images and column statistical charts.Combined the results with the landscape pattern index analysis of the study area,the scientificity and accuracy of the evaluation process are ensured,mobilizing the enthusiasm of the staff,reducing the risk of corruption to a certain extent,and promoting innovation of China′s administrative system.