Cordyceps are notable medicinal fungi in China, which pathogenic on insects and with high biodiversity in tropical and subtropical regions. Recently, three new Cordyceps species, Cordyceps changchunensis and Cordyceps jingyuetanensis grow on pupae of Lepidoptera, and Cordyceps changbaiensis grows on larvae of Lepidoptera, and one new record of Northeast China, Cordyceps taishanensis, are found in Jilin Province, China and detailed descriptions were obtained based on morphological and ecological characteristics. These three new species are similar to Cordyceps militaris group but distinctly distinguishable from known species. Cordyceps changchunensis, characterised by its small and light yellow to orange stromata that forks-like occasionally, covered with white mycelium at base of stipe, globose to ovoid perithecia, is macroscopically similar to Cordyceps militaris. Cordyceps changbaiensis clearly discriminated from other Cordyceps species by its white to orange and branched stromata, clavate to cylindrical fertile apical portion, immersed and globose to ovoid perithecia. Moreover, unbranched, clavate and orange to light red stromata, almond-shaped to ovoid and immersed perithecia differ Cordyceps jingyuetanensis from other Cordyceps species. ITS and nrLSU sequences are undertaken, and phylogenetic trees based on Maximum Likelihood analysis and Bayesian inference analysis confirmed the results of our morphological study. The phylogenetic result showed that the three new species gather with Cordyceps militaris but formed clades alone. Further analysis shows that the group of Cordyceps militaris mainly host on larvae of Lepidoptera.