Language is the most important communication tool for human beings, and there is nothing happier for parents than to hear their children shout “Dad, Mom” for the first time. However, we know that the ability to speak is not innate, but develops and improves as the child grows and is stimulated by the external environment. During this period, language dysfunction may occur for one reason or another. First of all, we have to understand the language development of normal children: children begin to laugh in April, babbling in May-June, unconsciously shouting mom and dad in July-August, imitating waving goodbye and clapping welcome in September, and then consciously shouting mom and dad at the age of 1 year, i.e., shouting dad when they see him and shouting mom when they see her. At 1.5 years old, the child can identify body parts such as eyes and nose. At 2 years old, the child can control urination and defecation and can tell the caregiver when he/she has the urge to defecate, and can express phrases such as “mommy come, eat koko”. At 2.5 years old, they can distinguish size and quantity, recognize several colors, and express “Mama eat rice”; after 3.5 years old, their speech ability is close to that of adults, such as expressing “Let’s go home and eat watermelon, okay?” They like to listen to stories and can retell them. Of course, not every child’s language development is static, which is very much related to the parents’ education and the language environment. But if the child has the following conditions parents must be alert: 6-7 months of articulation is very little and brief eye contact with people; 9-10 months still do not recognize the family, will not imitate the wave bye-bye, clap hands to welcome; 1 year after the age of no meaningful pronunciation, will not take the initiative to call out to mom and dad; 1.5 years of age of the language of the adults do not understand, i.e., you ask him where his eyes, nose, he can not point out, can not listen to your simple instructions: such as take shoes, etc. Simple instructions: such as take shoes, etc.; 3-4 years old still have obvious lisp or speech is not fluent (i.e., stuttering), and has affected his communication with other people; has been acquired normal language and in some diseases (such as encephalitis, traumatic brain injury) after the loss of language function and so on. Parents must observe carefully and go to the language specialist clinic in time to help their children find out the cause of the disease and understand the type of language disorder, and get professional language rehabilitation training guidance and treatment in time, so as not to miss the child’s optimal language learning period and ultimately affect the acquisition of normal language.