Objective To conduct correction training for a preschool child with motor dysarthria of unaspirated root tongue/g/aspirated to explore the effectiveness of training methods. Methods A single subject A-B experimental design was used to correct the root tongue tone/g/for children with aspirated tongue to compare the differences before and after training. Results The correct pronunciation of the root of tongue sound/g/in the children was significantly improved

and the probability of aspiration of/g/was significantly reduced（P=0.016）. Conclusion Visual feedback of airflow during pronunciation through paper and candles

exhalation before pronunciation reduces respiratory support and enhances the resistance of the pronunciation part

reduces airflow during pronunciation

and strengthens it through phonological contrast intensive training

which can effectively improve the patient on unaspirated root tongue sound/g/aspirated.