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A concept of testing the equivalence principle with optical readout in space(TEPO)has been proposed[J.Jpn.Soc.Microgravity Appl.25(2008)423].We further discuss the feasibility of TEPO using LISA(laser interferometer space antenna)Pathfinder technologies,such as a heterodyne interferometer,an inertial sensor,drag-free control and discharge technique,and determine that the equivalence principle could be tested at 8×10(-17)with one day integration.