Abstract: Objective To observe the effect of speech therapy on the intelligence of children with developmental retardation of speech.Methods 20 cases of children with developmental retardation of speech were evaluated and individual language training program was made,especially trainings of abstract thought,logical thought and development of cognition ability of attention.All of the training contents were combined and make into play form.The training prolonged for 1～3 courses.Intelligence test and test of the level of language development were performed before and after the training.Results After training,10 children(50%) reached the general level,the total efficiency was 100%.Conclusion The multidisciplinary language training can improve intelligence,level of language development of children with developmental retardation of speech.

Key words: developmental retardation of speech, speech therapy, level of language development, verbal intelligence quotient(VIQ), development quotient(DQ)