SUMMARY
A megathrust earthquake with Mw 9.0 occurred in the North-western Pacific Ocean on March 11, 2011. From the energetic particle flux from WIND, CLUSTER and GOES in different L locations, some variation can be found around the earthquake. Among the three satellites, WIND is used to identify solar activity, and GOES is used to detect the changes from ground source. And during the same period, a magnetic storm with intensity -80nT occur. In order to validate the particle flux variation, multi-parameters relationship is compared. The results show that: (1) all energetic fluxes variation can reflect the solar activity. The far ones are connected with the F10.7 and the near ones are connected with Dst/Kp. (2) The energetic particle fluxes give a scarp change in all energy bands at the beginning coupling period and when the space recovers to be quite, the fluxes will have a long decreasing tail from high to low energy. (3) The coseismic and after effect have been detected in GOES and the pre-seismic emission should exist because the bigger decreasing fluxes in GOES are responding to the period with smaller Kp.