The China -Russian bordering Heilongjiang River experienced the worst flood since 1984, with a return period excess 100 years in the lower reach. Dike breaches occurred from Luobei County to Tongjiang City. The multi-satellite remote sensing data show the capability for continuous and dynamic flood monitoring, providing near real-time and effective flood information for decision making and disaster management. It demonstrated that satellite remote sensing has been a viable alternative or supplement to in-situ observations especially over the ungauged area.