Vibration　of　the　double-deck　sandwich　plate　with　pyramidal　lattice　core　is　investigated　in　the　present　paper.　The　structure　consists　of　three　thin　panels　and　two　lattice　cores.　The　lattice　truss　core　is　modeled　by　a　continuous　material.　The　equation　of　motion　of　the　double-deck　lattice　sandwich　plate　is　established　by　Hamilton＇s　principle　in　which　the　displacements　are　expressed　with　a　simple　method,　and　the　natural　frequencies　of　the　structure　are　calculated.　The　effects　of　structural　parameters　on　the　vibration　characteristics　of　the　double-deck　lattice　sandwich　plate　are　analyzed　and　discussed.　The　present　method　will　be　useful　for　the　vibration　analysis　and　design　of　the　sandwich　plates　with　lattice　truss　core.