Abstract:This paper gives a detailed description on the morphological characteristics and variations of cross-field pit on the tracheid side and the ray parenchyma cell side under SEM and TEM. There are usually formed a light color halo around the pit aperture of cross-field on the tracheid lumen side under SEM. The paper reports the ultrastructure and radial pattern of microfibrils or microfibril strands on the tracheid side of the cross-field pit membrane in the wood of Cryptomeria fortunei Hooibrenk ex Otto et Dietr. The pinoid pit membrane of Pinus roxburghii Sarg. shows the radial microfibril strands only at the margin of membrane. Meanwhile, authors have found a very special type of taxodioid pit with extended aperture in Abies nephrolepis (Trautv.) Maxim. as well as in some other species of the genera: Abies, Larix and Picea koraiensis Nakai.