Propagation　of　Lamb　waves　in　a　functionally　graded　piezoelectric-piezomagnetic　material　plate　with　material　parameters　change　gradually　along　thickness　direction　is　investigated.　The　power　series　technique　is　employed　for　solving　the　governing　differential　equations　with　variable　coefficients.　In　numerical　examples,　the　influence　of　the　variation　of　each　parameter　on　dispersion　curves　and　cut-off　frequency　for　electrical　and　magnetic　open　case　is　discussed.　The　results　obtained　indicate　that　graded　elastic　parameters　and　mass　density　affect　the　phase　velocity　remarkably.　Some　other　graded　electrical　and　magnetic　parameters　affect　the　phase　velocity　a　little.　The　cut-off　frequency　is　close　related　to　two　elastic　parameters　and　mass　density,　while　other　material　parameters　almost　can＇t　affect　it.　All　the　results　may　provide　theoretical　guidance　not　only　for　the　analysis　and　design　of　high　performance　electro-magnetic　transducers　but　also　for　the　ultrasonic　nondestructive　evaluation　(NDE)　of　functionally　graded　piezoelectric-piezomagnetic　materials.