Abstract: Considering the dynamic change of lake and land area, and the fact that land-use change has become the second largest greenhouse gas emission source after fossil energy combustion, this paper originally analyze the changes of the area of lake in a specific region and its indirect carbon effects. Based on the data obtained from remote sensing images in 2005, 2010 and 2015, the carbon emissions and carbon intensity changes from lake to four types of land in Wuhan city were assessed by the recognized model measuring carbon emission. The results show that: (1) From 2005 to 2015, the lake area in Wuhan decreased by more than 10  km2, and this trend accelerated after 2010. the reduction in 2010-2015 was about 2.04 times that in 2005-2010；(2)Although the conversion of some cultivated land, woodland and grassland into lakes leads to an increase in lake waters, the conversion of large areas of lakes into construction land directly results in significantly less water area;；(3)From the perspective of total carbon emission, the water conversion area was carbon source, and the carbon emission in the last five years was 1.46 times of that in the first five years. The carbon emission intensity was 0.03 t/km² from 2005-2010 and 0.04 t/km² from 2010-2015. The carbon emission intensity has increased obviously. In view of the situation of lake use in Wuhan, measures are put forward, such as “putting landscape, forestry, fields, lakes and grasses” into a unified management mechanism, standardizing the utilization of land resources, and restricting the excessive expansion of construction land.