Slurred speech in 3-year-old children is mostly abnormal. It may be caused by pathological factors such as abnormal structure of articulatory organs and hearing impairment, or it may be caused by non-organic factors such as psychological problems and poor language environment of the child. However, no matter which of the above-mentioned factors lead to 3-year-old children’s lisp, it is an abnormal situation, and they should consult a doctor to clarify the cause and intervene as soon as possible to prevent the normal communication in the future. Pathological factors: 1. Abnormal structure of articulation organs: 3-year-old children’s lisp may be caused by abnormal structure of articulation organs, which mainly refers to the child’s teeth, gums and tongue. If there are abnormalities in these organs, it will lead to children’s unclear pronunciation, which requires targeted treatment according to the cause and language guidance at a later stage. 2. Hearing impairment: children with hearing impairment will prevent them from hearing and distinguishing sounds accurately and timely, which will lead to slurred speech. Second, non-pathological factors: 1, not mastered the position of pronunciation: children have not fully mastered the normal position of the organ of pronunciation, later, as long as they are guided by intervention, they can improve; 2, psychological factors: infants and children are afraid to speak due to fear or shyness, they also have a lisp, if the problem is not eliminated in time, a more serious language disorder may be formed, and psychological intervention is needed; 3, poor language environment : poor language environment for children, infrequent communication between family members and children, or communication in multiple dialects at home, will affect the child’s language development, and some children intentionally imitate the state of other people’s unclear speech, generally after language training can be restored to normal.