Because　of　the　mounting　errors　of　position　sensors　or　the　influence　of　static　loads,　a　eccentricity　exits　between　the　journal　and　the　bearing　center,　namely　the　static　working　point　of　the　bearing　will　excursion.　So　the　effects　of　the　static　working　point　on　the　dynamic　characteristics　of　bearing　are　discussed　first.　After　further　considering　the　restrict　of　magnetic　force　saturation,　the　synthetical　dynamic　stiffness　of　permanent　magnet　biased　magnetic　bearing　(PMEB)　is　defined　for　the　first　time.　At　last,　the　steady　region　of　the　PMEB　is　presented　by　analyzing　the　effects　of　the　static　working　point　and　the　bias　magnetic　field　on　the　bearing　stability,　which　provides　the　theoretics　basis　for　the　design　and　analysis　of　PMHB.