In order to elucidate surface performance of wood treated by microwave plasma,surface wettability of wood both untreated and treated by plasma were studied by measuring contact angles of liquid water and variance of the surface was observed with SEM.Results showed that the contact angle decreased to zero after treated by microwave plasma,even if the treated condition was very weak.This indicated that wood wettability increased strongly by plasma treatment.A coarser surface caused by ablating was observed under SEM after treated by plasma.The coarse surface could possibly increase the wettability of wood surface.