Objective To analyze the characteristics and differences of language development in children with autism spectrum disorder (ASD),global developmental delay (GDD) and developmental language delay (DLD),in order to provide evidence for early identification and intervention. Methods ASD,GDD and DLD children at the age of 18 to 36 months and diagnosed from March 2017 to December 2018 were included,and divided into ASD group (n=155),GDD group (n=92) and DLD group (n=162). The subjects and their parents completed the Early Language Development Process Scale to evaluate the language development level of children. Results 1) The median scores of ASD,GDD and DLD in P₇₅-A (speech and language expression),P₇₅-B (auditory perception and comprehension),P₇₅-C (visual-related comprehension and expression) and P₇₅-total (total score) were 17,10,3,31;16,9,1,26;14,7,0,21 respectively. 2) There was no significant difference on P₇₅-A scores between girls in the GDD and DLD groups (H=5.503,P=0.057),but the difference between ASD and DLD,GDD and DLD were statistically significant both in boys and girls (P<0.05). 3) There was no gender difference on scores of the four parts between ASD and GDD group,but there was gender difference on P₇₅-A score and P₇₅-total score in DLD group (Z=-2.117-2.010,P<0.05). Conclusions The degree of language development impairment in the three groups ranging from severe to light is ASD,GDD,and DLD.The ability of auditory perception and comprehension and vision-related comprehension and expression of ASD and GDD group perform worse than DLD group; and the language development of girls in DLD group is better than that of boys.