A type of calc-alkalic rock-biotite-pyroxene diorite was discovered in the Shuiquangou weakly-aklaline complex of northern Hebei. Its mineral compo- sition shows that it is possibly a new type of igneous rock. It consists of bio- ti te (about 15%)，augite(about 15%)，oligoclase-a ndesi ne(approximately 65%)， K一feldspar (some 5%)and other accessory minerals(less than 1%).Compared with other rocks of Shuiquangou complex, it contains higher LREE and high field strength elements as well as Fe, Mg and Ca and lower Si02，K20+Na2O- and A1203.