Objective To study language comprehension and expression of infants in Jücounty,Rizhao city, in order to provide scientific basis for early intervention Methods Totally 208 infants aged 8-16 months were randomly selected into this study from January to December 2017,and their parents were investigated by Chinese Communicative Development Inventory(CCDI) to report infants' language abilities. The section one of CCDI-Words and Gestures was studied,which includes first signs of understanding(involve three sentences),phrases,starting to talk(imitating and labeling),vocabulary understanding and expression. Results Most 8-month-old infants showed response to phrases like “their name,papa/mama,do not xx” before they starting to speaking. Infants aged 8 months could understand 12 phrases on average,and 26 phrases at 16 months old. Imitating speech ability developed one month earlier than the ability to name the objects. The ability to name the objects of girls developed two months earlier than boys. Conclusions 8 to 16 months is a period of rapid language development time for infants to understand language. Infants aged 8 months start to show response to language,and infants can comprehend quite a few short sentences at 16 months old. The expression ability of girls develops two months earlier than boys.