The placer anomaly with high content of Chromiumbearingpyrope and Magnesiachromespinel in Xiawengshao area, Shibing County, Guizhou Province, It is distributed in the gravel—clay rock from the Neogene Wengshao Formation in Duimenpo area, north side of the Xiawengshao basin, and the “unexplained” deposits of sand—gravel in the slope zone, 2 km south side of the Xiawengshao basin; such a phenomenon constitutes the high content of placer anomalies. By the comparison and analysis with characteristics of garnet in rocks such as lamproite, kimberlites and basic-ultrabasic rocks and eclogites, It's still hard to explain the source of the placer anomaly. Even using the viewpoint of Zhang RenJun (1985&) that the distribution of diamonds and associated minerals in the Yuanshui River is “the secondary glacial drift”, it is also difficult to explain the source and mineral composition problems.This phenomenon is still an enigma. So, the purpose of this article is to provide guidance for making a breakthrough of primary diamond deposits in guizhou.