Choose the new breed red huu onion "Xi Cong -2" is use by laser e ntice beamed It have high altar, high quality ,low sporangium and so on .From th is experience ,from reseach this new breed under all kinds of condition compare store keep greenness We thenk:cold storage way ,it is use refrigeratory engine r efraction Trroved the temper ature is under the Zero,addition low humidity, asep sis measure ,it is good for keep greenness.