Located in the Middle Triassic Baifeng Formation of Western Guangxi, the Ronghua manganese deposit is the first economic Mn deposit discovered in Baifeng Formation. Based on geological exploration, laboratory analysis, testing and engineering work, the authors studied the ore deposit in such aspects as strata, structure, sedimentary evolution, ore-bearing horizon, ore body and ore characteristics, genesis and prospecting criteria and, on such a basis, reached the conclusion that the Ronghua manganese deposit is a typical sedimentary-manganese hat deposit, strictly controlled by strata and structure. The main types of manganese minerals include vernadite, psilomelane and pyrolusite. The formation of the ore deposit was mainly related to original sedimentation, weathering and leaching. There exists good prospecting potential between the turbidite of Baifeng Formation and the carbonate rock of Luolou Formation. The strata of the Baifeng Formation are widely exposed in western Guangxi. These typical prospecting criteria may contribute to finding new manganese deposits and have a universal meaning.