“Consumer” is originally an economic rather than legal concept. Legislatives are struggling in legally defining “consumer”. China’s Consumers’ Rights and Interests Protection Act does not clearly define “consumer”, which results in enormous problems in judicial practice and law enforcement, since its enactment 20 years ago. The recent 2nd Amendment introduced some break through mechanisms, but the fundamental issue of legally defining “consumer” was completely untouched. Based on a comparison of the legal definitions of “consumer” adopted in some developed and developing countries or regions, and on the critical analysis of the status quo of defining “consumer” in China, this paper proposes on how “consumer” should be legally defined. A draft definition is also proposed and submitted accordingly.