[Objective] The research aimed to clarify the relativity between yield and quality of alfalfa and salt stress.[Method] In the pot experiment with 6 alfalfa varieties as test materials,the effect of salt stress on important quality characters and fresh grass yield of alfalfa were studied.[Result] There was no evident differences among varieties and NaCl concentration for the crude protein content of alfalfa.A obvious differences were among varieties for crude fiber content,in which,the differences between Zh...