Metal ion contamination in the environment causes hazardous effects on plant growth, yield production, and also led to physical and chemical changes. Sunflower(Helianthus annus L.) plant is added to be one of the most edible seed crop growing in harsh climatic regions.it also have good water use efficiency. The study remains unclear about the physiological growth of sunflower with treatment of Zinc. A pot experiment was conducted in the old Botanical Garden at University of Agriculture, Faisalabad to analyze and check the impact of heavy metal zinc sulphat stress on sunflower (Heliantuus annuus) two hybrids FH687 and FH674. After three weeks varying concentration of zinc sulphate (0mM, 20mM and 40mM) along with 250ml tap water was applied in rooting medium. Every day 250ml water were applied to each pots .The crop was harvested after 45 days and morphological parameters were studied such as root length, shoot length, root weight, shoot weight and number of leaves. Zn stress significantly reduced the growth attributes. A marked drop in all morphophysiological attributes such as root length, leaf number and shoot length was recorded. Maximum reduction of growth, biochemical and physiological parameters was noted at 40mM concentration of zinc. Zinc toxicity involve in inhibition of cytoplasmic enzymes and damage to cell structures due to oxidative stress.it alter the catalytic function of enzymes which damage the cellular membranes and inhibit root growth. Zinc stress cause maximum effect on hybrid FH674 as compared to other hybrid FH687.