The Chuncheon nephrite of South Korea is becoming more and more common on Chinese market. It is usually called the Chuncheon nephrite or Chuncheon jade, and on the market it is often referred to as "Han Guo Liao". In this study, polarizing microscope and electron microprobe (EPMA) analysis were used to study Chuncheon nephrite samples with the emphasis placed on the mineralized zone. The results show that the major mineral component of Chuncheon nephrite is tremolite, followed by diopside, calcite, dolomite and talc. The mineralized zone is classified into marble zone, alteration zone, nephrite+alteration zone and nephrite zone. The mineralized zone of the Chuncheon nephrite was formed by metasomatism and deformation of the dolomitic marble zone.