Shaanxi dongyu bio-tech co., ltd's tea parks locate in the mountains of qinling and bashan, belongs to the very north tea area of high altitude, high latitude, high temperature difference, full of oxygen and zinc. The area is far away from city, its soil, air and water are nature and no pollution, which is very suitable for the growth of good tea. The trace elements in tea, such as zinc, selenium, etc., tested by the state tea research center, shows that it is higher than that of other tea area in china. The tea from our gardens has about 50-80 gram of selenium per kilo, about 3.0 gram of zinc per kilo and about 35-40% of tea polyphones. Now we got the certificate of qs, iso9000, haccp, iso22000 and organic production certificate. As per clients requirement