Impact　transient　responses　of　the　lattice　sandwich　plate　under　various　boundaries　are　studied.　The　method　of　reverberation　ray　matrix　(MRRM)　is　extended　to　study　the　stress　wave　propagation　in　the　lattice　sandwich　plate　with　various　boundaries.　Displacement　wave　solutions　of　the　lattice　sandwich　panel　under　arbitrary　boundaries　are　obtained　based　on　the　first　order　shear　deformation　theory,　and　the　broadband　excitation　responses　can　be　determined.　The　reverberation　ray　matrix　can　be　derived　by　using　the　wave　solutions,　boundary　conditions　and　dual　coordinates　of　the　lattice　sandwich　panel.　Through　the　fast　Fourier　transform　algorithm　(FFT),　the　broadband　impact　transient　responses　of　the　lattice　sandwich　panel　under　various　boundaries　are　obtained.　It　demonstrates　that　the　high　frequency　component　of　broadband　excitation　dominates　the　early　impact　transient　responses　of　the　transverse　acceleration　and　shear　strain.　Early　impact　transient　responses　of　the　lattice　sandwich　plates　can　be　reduced　much　through　strengthening　the　boundary　restriction.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.