Based on geochemical characteristics of iodine, this paper has studied thedevelopment of iodine haloes around deep-seated concealed polymetallic depo-sits. With case history of exploration, it describes in detail distribution patte-rns of geochemical primary iodine anomalies under several different ore-hostinggeological conditions; through statistical study of variation regularity of ave-rage bone content in rocks from different ore districts and in rocks and/orores perpendicular to the ore body, we have determined the dispersion distan-ce of iodine anomaly, and pointed out that this element lies invariably at thehead of the vertical zonation and therefore serves as a distant indicator ele-ment. It is firmly believed that boine anomalies can play a unique indicatingrole in the prospecting for deep-seated concealed ore deposits.