Primitive euconodonts are extrmely abundant and varied in the Late Cambrian in western Shandong Province. Two new genera are established, including Camconodontus gen. nov. and Laiwunodus gen. nov. Among them the following species are described: Camconodontus rotundatus gen. et sp. nov., Camconodontus sp., Laiwunodus lateronodus gen. et sp. nov., and Laiwunodus sp.. In addition, the Genus Dasytodus is emended, with Dasytodus posteronodus sp. nov. being added. The discovery of new species has greatly enriched and deepened the already known concept about primitive euconodonts. The study of the internal structure of conodonts faciliatates the differentiation among primitive euconodonts as well as part of paraconodonts more correctly. Together with the internal struture, some important morphological characteristics are selected. Three types of primitive euconodonts and one type of paraconodonts easily confused with each other are differentiated, making the complexity on primitive euconodont taxa greatly simplified. And this work will bring much convenience to further studies on other related problems.