YDS series liquid nitrogen container is applicable to store biological sample or liquid nitrogen for a long period under static conditions. It is made of high-strength aluminum alloy structure and glass fiber reinforced plastic, which make the products with features of light weight and high strength and long holding time of liquid nitrogen and economical to assure safe use. Among them, the YDS-10 Liquid Nitrogen Biological Container won National Silver Metal in 1984 and Famous Brand at 99 International Agriculture Fairs. The YDS-30 Liquid Nitrogen Biological Container won the Prize of High-quality Product by the Ministry of Aerospace and the Ministry of Agriculture, stock raising and fishery in 1983 and the title of Famous Brand at 99 International Agriculture Fairs of China. YDD series stainless liquid nitrogen container is welded with high intensity stainless steel under protection of inert gases. It is in accordance with national standard of GB/4174-33. It is applicable to store sperm and other active biom aterials for farming, medical, industrial, scientific sectors by using the liquid nitrogen as the refrigerating agent as well as cool treatment, cool assembly and cool test for relevant materials and instruments. YDD-450-600B liquid nitrogen container is mainly used for long term storage of umbilical stem sell and the nitrogen liquid is controlled by automatic controller with functions such as automatic liquid addition and alarm, which is safe and reliable for use.