Objective To investigate the application of pictural autism screening scale for infant and toddlers(PASS-IT) in the early screening for autism spectrum. Methods Ninety children with autism spectrum disorder( ASD),ninety-six age-and gender-matched children with global developmental delay(GDD) and ninety-two normal children were included to study the reliability,validity,project analysis and optimum limit of the scale. Results The Cronbach α coefficient in the Chinese version of PASS-IT was 0. 895. The split-...