Abstarct: Nowadays, the application of antioxidants and plant growth regulators has bean discussed for decreasing the negative effect of different stresses. Amino acid and potassium as one of this matter that causes resistance of plant to stress. To investigate this subject an experiment was conducted in 2014 at the University of shahrood. Experimental design was split factorial baxsed on randomized complete block design with three replications. Treatments were 2 levels of water deficit stress (8 days and 16 days) as main plot and three levels of amino acid mixture foliar application (0, 400 and 600 ppm) and three levels of potassium foliar application (0, 15 and 30 mM) as sub plots. In this experiment water deficit stress reduced leaf area, capitol and stem dry weight, leaf relative water content, stem heignt, seed yield, chlorophyll a and b, total chlorophyll and potassium in leaf. The namber of infertile seed increased in stress conditions (16 days). Amino acid foliar application increasea leaf stem and capitol dry weight, kernet to seed coat ratio, 1000 seed weight and number of seeds in capitol. Leaf dry weight, stem height, number of seed in capitol, seed yield, leaf relative water content, chlorophyll and potassium of seed were some of traits that significantly increased by use of potassium. Percent of protein and seed oil increased by use this substance in its high level (30 mM) in order 1.6 percent and 2.67 percent respectively. Potassium decre ased the of number of hollow seeds per capitol. Foliar application of amino acid and potassium mixture could greatly improve the harmpul effect of irrigation stress, and finally in the range of this research can introduced intraction of 400 ppm amino acid mixture with 15 mM potassium as a best combinined treatment.