Abstract: Tosolvethemassivepropellantproblemfordeepspacemissions，theconceptofanelectromagneticpropellerwasproposed.Theinterstellarplasmawasusedaspropellant，andtheelectricdrifteffectwithorthogonalanduniformelectricfieldandmagneticfieldwasusedtoproducethethrust.Dependingontheplasmadriftvelocity，theformulaoftheelectromagneticpropellerwasderivedinthenonrelativisticcaseandtherelativisticcase.Therestrictionofelectromagneticpropellerdesignwasanalyzed.Theelectromagneticpropellerschemeanddemonstrationexperimentsweredesignedfordeepspaceanddragfreecontrolmissionswithpracticalengineeringlevel.Astheresultofcalculation，carryingnopropellant，theelectromagneticpropellerdesigncouldobtain1056m/sspeedincrementperyearontheinterstellartravel.

Key words: electricpropulsion, plasma, electricdrift, interstellar, relativisticeffect