ABA (Applied Behavior Analysis) is a natural subject that studies the relationship between behavior and environment.

In the early 1970s, Lovas put forward the principle of ABA for intensive intervention. Adopt DTT wheel operation teaching method to realize 40 hours of intensive training every week. It can decompose the skills to be taught into executable behavior units, train each behavior unit through special means until it is mastered, and finally connect the mastered behavior units in series to form more complex behaviors, which are manifested in language, imitation, game skills, social interaction and so on.