Abstarct: to study the interactive effects of ultrasouns and drought stress on some traits of corn A filed experiment with 3 replications was conducted in research farm of Shahrood University in 2014. Treatments were factorial arrangement of three levels of drought stress (control, no irrigation from flowering stage onward, and no irrigation from dough stage onward) and five levels of ultrasound (control, 2, 4, 6 and 8 minutes exposure to 42 kHz). The results showed that drought stress significantly decreased the amount of leaf area index, shoot dry weight, leaf dry weight, seed dry weight, dry weight of ear cover, ear diameter, number of rows per ear, cob weight, the biological yield, grain yield, leaf relative water content and the amount of carotenoids as compare to control. In comparison to control, the value of reduction in these traits was 37%, 39%, 33%, 21%, 13%, 14%, 37%, 3%, 25%, 40%, 50%, 19%, 46% and 31%, respectively. Stress caused an increase in the amount of soluble sugars and harvest index by 19% and 11%, respectively compare to control. Ultrasound also increased shoot dry weight (9%), leaf dry weight (3%), grain weight (5%), ear diameter (18%), number of ears (8%), biological yield (15%), grain yield (43%), HI (38%), soluble sugars (28%) , leaf relative water content (19%) and germination rate. The interaction between stress and ultrasound was significant for plant height, stem diameter, seed protein content, contents of chlorophyll a and b. In the present study the possibility of using ultrasonic waves as a seed treatment to reduce the damage caused by water stress, there is an increase in quantity and quality.