Poly(methyl　acrylic　lithium　ate)　composite　montmorillonite　(MMT.)　was　prepared　by　solution　and　heating.　The　phase　relationship　of　composite　MMT　was　analyzed　through　powder　XRD,　thermal　analysis　and　IR　spectra,　its　ionic　conductivity　was　obtained　by　AC　impedance.　We　found　that　MMT　can＇t　get　pure　phase　with　poly(methyl　acrylic　lithium　ate),　only　partial　poly(methyl　acrylic　lithium　ate)　can　embed　into　layer　of　lattice　of　MMT.　The　ionic　conductivity　of　composite　MMT　is　lower　than　pure　MMT　at　room　temperature.