Abstarct: The toxic elements such as lead and nickel increased by industrial and environmental pollution that it made risk for human. One of the best ways to deal with injuries toxic mextals in plants is the use of antioxidan material. For this purpose, a field experiment was carried out in shahrood university to evaluate the effects of heavy mextals in acid rain and ascorbic acid foliar application on some physiological and morphological characteristics of green beans (Phaseolus vulgaris L.). Treatments were three levels of nickel (0, 200 and 400 mM) as the first factor, three levels of lead (0, 200 and 400 mM) as the second factor and two levels of ascorbic acid foliar application (0 and 20 mM) as the third factor. This treatments arranged in factorial experiment baxsed on randomized complete block design with three replications. Heavy mextals and ascorbic acid foliar application were, 54 and 61 days after planting respectively. Sampling was performed 1 week after ascorbic acid foliar application. The results showed that nickel decreased stem height, stem diameter, dry weight of leaves, stems and pods, leaf area index, total chlorophyll, carotenoids and increased pods protein. Lead caused to increase in leaf area, leaf relative water content, total chlorophyll, carotenoids. High lead concentration (400 mM) reduced the pod yield. Ascorbic acid foliar application decreased the absorption of nickel and lead in plant leaves. The most amount of protein (25.5 %) and the highest pod yield (8195.75 kg/ha ) and lowest LAI and leaf water content was observed in the treatment of 200 mM Ni × 0 mM Pb. Generally, 20 mM concentrathion of ascorbic acid couldn, t improved injury of lead and nickel wile and lead concentration of 200 mM improved the physiological parameters in green beans.