ICESat's Geoscience Laser Altimeter System (GLAS)emits 3.4 million laser pulses per day. Typically one third of ICESat's laser pulses occur over land and ice, and about half of the ocean surface is obstructed by opaque cloud cover, yielding 1 million valid ocean elevations per day, ICESat bring a new perspective for marine altimetry. It given ICESat determined the sea surface height and the mesoscale sea surface anomalies through ICESAT comparison with the TOPEX in this paper. Major global ocean sea level anomaly and mesoscale ocean features can be detected with the TOPEX United ICESat. ICESat GLA15_026 sea surface height accuracy can be tested, the data obtained through the use of marine ICESat high compared with the TOPEX found, We found height difference of about 10.0cm between sea surface height ICESat identified with sea surface height TOPEX identified relative to the same mean sea surface height through the ICESat altimeter data comparison with the TOPEX altimeter data the deviation along the track mean is − 4.4cm by Comparison of binary stars. Although the initial value of this deviation may be closely related to sea conditions, although ICESat GLA15_026 has improved due to the difference between day and night temperature variation, difference in the size of about 1 ∼ 2cm.