Behavior scale for autistic children The Autism Behavior Checklist for Autistic Children (ABC scale) was developed by Krugetal et al. (Krugetal. 1978) and introduced and revised by Professor Yang Xiaoling of Beijing Medical University in 1989, mainly for screening children with autism. AutismBehaviorChecklist (ABC scale), which consists of 57 items describing the abnormal performance of autistic children in sensory, behavioral, emotional and linguistic aspects, can be summarized into 5 factors: ① sensory (S), ② interaction (R); ③ somatic motor (B), ④ language (L): ⑤ self-care of life (S). The scoring method is based on the load of each item in the scale and the rating of “1”, “2”, “3” and “4” respectively. The score is “1”, “2”, “3” and “4” for each item. For example, item X has a score of “3”, so as long as the child has that symptom, regardless of the severity of the symptom, the score is “3”. For ease of use, the designer has indicated the number of points to be scored after each item. The number of items on this scale is moderate, and the assessment can be completed in 10-15 minutes, and there is no difference in the use of different ages and genders. To use the scale, parents were asked to draw a “tick” on each item of the ABC scale according to their child’s recent performance, and then calculate the score of each subtest and the total score of the scale. If the total score is equal to or higher than 31, the child is suspected of having autism; if the total score is equal to or higher than 62, the child is diagnosed with autism. The rater was required to live with the child for at least 3-6 weeks, and the teacher who completed the scale lived with the child for at least six months. Each item is rated as “yes” or “no”. A “∨” sign was used for “yes” comments, and no sign was used for “no” comments. A total score of ≥31 was used as the threshold score for autism screening; a total score of >53 was used as the threshold score for autism diagnosis.