The environmental pollution caused by cadmium, a heavy metal toxic element, has aroused geologists' attention. With the progress of the research work, it has been found that cadmium is not dispersive and, in certain geochemical conditions, it is likely to be enriched and can even form orebodies or deposits. Therefore, it is necessary to restudy and re_understand geochemical behaviors of cadmium. This paper describes some advances made in the study of the distribution and modes of occurrence of cadmium, and sums up the distribution and geochemical investigation of cadmium resources in China. It is suggested that we should strengthen the study of abnormal enrichment mechanism of cadmium and the release and circulation of cadmium in supergene geochemical process, which adversely affect the environment.