From February to June in 2001, there were two instruments for energetic particle detections on board of ZY‐1 (CBERS‐1) and SZ‐2, respectively. In this paper, data of energetic electrons from ZY1/CBMC and SZ2/XD are compared for this period. The energetic electron data from SZ‐2 by an X‐ray detector (XD) gives electron distribution at a height of 400km with a declination of 42₰, while Energetic Particle Detector inside the cabin of CBERS‐1 is on a polar orbit at a height of 800km, giving the global distribution of electrons of 0.5~2MeV. The results of the comparison show that, although the height is different, the lowest latitudes, where the energetic electrons are observed, and the longitudinal distribution are almost the same. This indicates that down to an altitude around 400km, the energetic electrons are still controlled by the geomagnetic field. This also shows that a coordinated analysis of data from these two satellite series are very helpful for understanding the lower part of earth's radiation belts.

The solar flare occurred on 2 April 2001 is the biggest flare in the 23rd cycle of solar activity, which is companied by a big solar proton event. The study was made to this event by combining the observation results from SZ2/XD and CBERS-1/CBMC. SZ2 has the orbit with 400km height and inclination of 42• , and CBERS-1