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The effect of the pathogen Embellisia astragali on physiology of standing milkvetch (Astragalus adsurgens) was studied in a 4-week study.Resistant variety Shanxi and susceptible variety Neimeng were used in this study.In the first week, stem-inoculated plants showed an obviously decrease in photosynthesis (A) without alteration of stomatal conductance (Gs), especially in susceptible variety.From the second week on, progressive decreases in A and Gs were observed, concomitantly with development of significant stem lesions.Water use efficiency (WUE) increased in the second week and declined progressively from the third week, the changes in resistant variety were smoother than susceptible variety.