The technology of satellite altimetry has made it possible to detect sea ice at large spatial scales,while the retrieved sea ice freeboard is a key parameter for inverting sea ice thickness. Moreover,obtaining accurate freeboard is significant for sea ice detection and the understanding of global climate change. Based on the CryoSat-2 satellite SAR mode altimetry data accumulated in the past three years,this paper selectes the available observation data by setting thresholds in the Arctic within the 60°N88°N latitude zone,and calculates the average monthly sea ice freeboard during 20152017. The results of the calculated freeboard in the research region are reliable according to the verification with the space-time matched measurements of IceBridge projects.