Abstract: The experiment with different cultivation methods was carried out to study the effect of straw bagged with net cultivation method on yield， quality and development of purple yam （also named purple Dioscorea alata L.）. The results showed that the tuber numbers per plant of purple yam cultivated in straw bagged with net can be appropriately increased， at the same time the tuber was also relatively large， resulting in obvious yield increasing. The purple yam tuber cultivated in straw bagged with net had the relatively elongated shape， and avoided underground pest damage and injury in the growth process and harvest. So it had a good commodity with beautiful shape， smooth， integrity; in addition， straw cultivation is beneficial to improve nutritious and healthy compositions， for example， yam saponin， soluble sugar， polysaccharide， mucin polysaccharide and so on. Straw bagged with net cultivation method also belongs to the straw cultivation， though it reduced the yam saponin and mucin content， its nutritious and healthy compositions were still high. The straw bagged with net cultivation method can improve commodity and quality of the purple yam.

Key words: purple yam, straw bagged with net cultivation method, yield increasing effect