The experiment was performed in the form of split split plots in a randomized complete block design with 3 replications for two years in Kermanshah Agricultural Research and Training Center. Irrigation (optimum, 80% and 60% of water requirement) and chemical fertilizer (100% and 50% recommended) and vermicompost (0, 2, 4 and 6 ton ha-1) arranged as main plots, sub plots and sub sub plots, respectively. The results showed that leaf area index was decreased from 4.51 to 1.6 from normal irrigation to intense drought stress. The highest yield of fresh forage (82.5 ton ha-1) was obtained in optimal irrigation treatment and combined use of 100% chemical fertilizer and 6 ton ha-1 of vermicompost and the lowest rate (30.1 ton ha-1) was related to severe stress treatment. (60% water requirement) and no use of chemical fertilizers and vermicompost. At all irrigation levels, the percentages of forage protein increased with the use of fertilizers and vermicompost, and the highest percent of forage protein (10.2%) was obtained in complete irrigation treatment and 100% fertilizer application and 6 ton ha-1 vermicompost. Based on the results application of 6 ton ha-1 vermicompost fertilizer can alleviate the negative effects of drought stress.