This　paper　introduces　a　kind　of　double　claw-pole　structure　generator　for　self-excited　retarder.Claw　pole　staggered　on　both　sides　of　the　rotor,axial　magnetic　circuit　constituting　the　N-pole　and　S-pole　magnetic　pole.Based　on　the　JMAG　software,　we　simulated　the　air　gap　magnetic　field　of　no-load　and　load　generator,　and　studied　the　influence　of　armature　reaction　on　the　air　gap　magnetic　field.Through　the　analysis　of　magnetic　flux　leakage　of　the　generator,　and　the　optimization　of　correlation　structure,　we　drew　the　relationship　curve　about　the　structure　parameters　of　the　no-load　motor　and　magnetic　flux　leakage　coefficient,　the　conclusion　we　obtained　will　provide　theoretical　reference　for　the　further　research　and　optimization　of　this　kind　of　motor.Finally,　the　no-load　characteristics　and　load　regulation　characteristics　of　the　motor　were　given,　and　it　turned　out　that　it　could　meet　the　required　excitation　power　for　self-excited　retarder.　©　2014,　Journal　of　Chemical　and　Pharmaceutical　Research.　All　rights　reserved.