Abstract: This paper establishes a locus equation of the shot according to kinematicsl principles.By using differential and integral calculus and trigonometric function,we have found the eztreme value of the angles of delivery and the best flying distances,with the falling points of the shot considcred. Thus a simple expressioa showing the relationships a m ong the best angle of delivery,the flying distance,the height of delivery point and its initial velocity can be attained and a diagram can be made by calculating,showing the best angle of delivery and the best flying distance.