By perfusion with trypsin at low concentration, the intra -pulmonary arterioles were separated carefully and cut into fine tissue pieces. These pieces were then washed with culture medium and used for culture of smooth muscle cells by method of adhesion to wall. Cells cultured were typical smooth muscle cells under light microscope, electron microscope and immunohistochemical test. The method is simple and convenient. It is also applicable to culture of vascular smooth muscle cells from other organs and provides ideal materials for vascular physiopathologic studies.