关键词: 汉语儿童；wh-词；疑问；非疑问；纵向研究

Abstract: This paper has investigated a Chinese childrens acquisition of whword shei by casetracking method. The research results show： 1） children acquire the interrogative of whword shei earlier than noninterrogative， and the developing characteristics are as follows： interrogative（1；04）→existential（2；04）→ universal（2；06）→rhetorical（3；01）； 2） children use the interrogative of whword shei more than noninterrogative， and the frequency is as follows： interrogative >universal>rhetorical>existentia； 3） the acquisition time and usage frequency of sheiexistential are contradictory， namely， it is earlier acquired but rarely used. While the case of sheiuniversalpair whword demonstrates the opposite tendency. It is acquired later but used more； 4） the position of shei in sentences developed from subject to object，then the attributive. Chinese childrens acquisition of shei is mostly shaped by language markedness， accessibility levels and task complexity.

Key words: Chinese children； whword； diachronic acquisition； interrogative； noninterrogative