The paper adopts mechanical knowledge, mainly analyzes dunk technique, when basketball player takes-off, it should increase himself rotational angular speed, let legs arrive at flat and straight, make gravity center and body rotational axis come to terms so that it can reduce rotational inertia and further arrives at increasing rotational angular speed effects, and, at the same time of taking-off, twists upper body also can continue to increase self-rotational angular speed, let dunk to be fiercer. Establish analytic hierarchy process model, according to weight result, it is clear that good awareness accounts for 43.7% of basketball player dunking required competence, when basketball player uses dunk technique, it requires that athlete should firstly possess good awareness, secondly, athlete should be adept in dunk technique, and the third is self-physique requirement.