There is an essential difference between a child’s naughtiness and hyperactivity, and the difference lies in the following points: 1. The difference in attention span. ADHD children no matter when and where, can not concentrate for a long time, even the general children’s favorite cartoons, comic books, board games, etc., can not concentrate on enjoying; but the urchin is completely different, in doing their own hobby, can pay full attention, and also hate the interference and influence of others. 2, the difference in will power. Naughty children’s hyperactivity often have a certain purpose, and have plans and arrangements, they have a strong willpower; while children with ADHD but weak willpower, do things without end. 3, the difference in self-control ability. Naughty children in a serious, unfamiliar environment, have strong self-control, and can be quiet and no longer noisy; while ADHD children are not this ability, often regardless of the occasion, in some serious occasions also make things out of line. 4. Differences in the flexibility of movement. Normal children do fast, repetitive and rotational movements, showing flexibility and ease; while children with ADHD are very clumsy.