Abstract: This research aimed to explore the most suitable germination and growth concentration, and provide scientific basis and data for seaweed fertilizers application in the artificial cultivation of F. arundinacea in our country, through the experiment of Festuca arundinacea seeds at different seaweed fertilizer concentrations. The results showed that among the 5 treatments of different seaweed fertilizer concentrations, group C （4.8 gL-1）had the highest germination rate of F. arundinacea seeds, which was 97.84%, and comparing with lontrol group increased by 15.68%(P0.01). The growth and root volume of F. arundinacea were 0.67 cmd-1 and 0.44 mL, higher than these of other groups. With the increasing of seaweed fertilizer concentrations, the changes of tall fescues growth, root volume, fresh yield and hay yield increased first then decreased. With the increasing of seaweed fertilizerconcentrations, the variation of root/cap took on a V shape trend. The tall fescues fresh yield and hay yield of group C were 148.38 kghm-2 and 42.45 kghm-2, which were the highest. The optimal growth conditions of F.arundinacea were under 4.8 gL-1 seaweed fertilizer treatment. Proper seaweed fertilizer concentration can increase the tall fescue seeds germination rate, advance the start period of seed germination and increase the yield of F. arundinacea.