Abstract: The described ammonitida fossils are collected from Yichun and Anfu places,being relation to 1 new family,5 new genus,8 new species and 1 undefinited species.According to Huaqiaoceratidae fam.nov.and Yichunoceras gen.nov.the evolut ion of ammonitida is described,and the international stratigraphic correlation i s discussed.