Abstract: This paper summaryly introduced the regional geological characters of Northwestern Guangxi, geological characters of the typical deposits of the super micrograin-type gold deposits,and analysed the metallogenetic conditions of the gold deposits, which consist of:conditon of the source bed, control factors of sedimetary facies and formation,ore-controlling condition of the structure,physical and chemical conditions of the mineralization and conditions of the superficial oxidation leaching and enrichment and preservation, On the basis of these,it probed into mineralization and metallogenic model,and established prespecting model. Lastly, it conducted minerogenetic forecast on various scales,and defined the thinking of the prespecting the superbig-type gold deposit.