We studied the priming effect parameters in preschool children with autism spectrum disorder. We compared the temporal dynamics of the influence of pre-exposure to visual image on the accuracy and speed of sound differentiation in children with normal development and with autism spectrum disorder. We observed significant differences in the severity of the priming effect and the temporal dynamics of the facilitation effect in recognition on presentation of congruent and incongruent combinations of stimuli in these groups. No significant differences were found between the groups of children with low and high severities of autistic disorder. After the training session with the recognition of simultaneous heteromodal complex signals, the facilitation of reaction to congruent combinations of stimuli with the introduction of incongruent combinations was close to that in the group of children with normal development. The characteristics of the manifestation of the priming effect in this case depended on the severity of the autistic syndrome.