Based on geochemical characteristics and tectonic setting of intrusive rocks in Zhoukoudian complex and a comparison with adakites, the authors have revealed that these intrusive rocks are similar to adakites in petrological and geochemical characteristics. 143Nd/144Nd87Sr/86Sr diagram shows that the projections are in the EMⅠ-rich mantleregion, suggesting that their material sources are related to EMⅠ-rich mantle.Besides,εNd(t)I Sr figure proves that the projections are within granulites and pyroxenite xenoliths in Hannuoba basalts. Further research indicates that Zhoukoudian complex was formed by partial melting of young lower crust in the North China craton in Mesozoic