The Pala area is the most important mining area for alluvial gold in Mayo Kebbi Region, Chad. Many companies tried to find rock gold in this area; nevertheless, they all failed to find any good ore bodies in spite of lots of trenching and drilling work. To illustrate the formation process and origin of gold anomalies, the authors conducted geochemical exploration of gold mines in Pala with the purpose of summing up the characteristics of secondary halos of Au in African tropical grassland landscape. Vertical soil profile measurement was also made to analyze the geochemical behavior of Au during pediplanation so as to explain the origin of gold anomalies. The results obtained by the authors are of directive significance for gold exploration work of China's companies in Africa under the same landscape condition.