Abstract: The tissue structure of the pericarp of Juglans regia L.may be divided into three parts,i.e.exocarp,mesocarp and endocarp.The development stage can be divided into the early stage and late stage.The exocarp is consisted of lays of cells.There are numerous glandular hairs in the epiderm cells in the early stage and the corneous layer cells and stomata are developed in the late stage.The spots in fruit surface are different in the different varieties and positions of fruit.The mesocarp is the main parts of pericarp,and there are vascular bundles in it.The boundary lines between exocarp,mesocarp and ndocarp are not clear in the early stage,but the numbers of vascular bundles increase and the branches appear,as well as the parenchyma cells are enlarged in the late stage.The cells of endocarp is small and transparent in early stage,and changes into hard shell that is made of lignification stone cells.The tissue of vascular bundles is developed and becomes ereticulate vein.