The Jiaodong area was located in the southern part of the Paleoproterozoic JiaoLiaoJi belt. Previously, many studies on the Precambrian geological events in this area have been conducted. However, the Paleoproterozoic intrusive rocks are lack of indepth study. Based on the detailed field investigation of the Paleoproterozoic monzogranite in Changyi area, we discussed the genesis and formation age of granite and the age of deposit of Fenzishan Group which related to it by analyzing the geochemistry, zircon UPb dating and Hf isotopic. The monzogranites studied in this paper have high total alkali content (K2O+Na2O=693%~811%), low Al2O3 (989%~1411%), low MgO (001%~063%) and are metaluminous rocks (the saturation index A/CNK is 099~156). It is obviously depleted in high fieldstrength elements such as Nb, Ta, P and Ti, the degree of fractionation of the light and heavy rare earths is higher. Five samples of zircon LAMCICPMS and a SHRIMP dating, forming age of 2045±8 Ma~2187±9 Ma, indicating that granite was formed in the Paleoproterozoic. The zircon age of the finegrained monzogranites intrude into the Fenzishan Group is 2080± 9 Ma and according to the previous research results, the deposition time of the Xiaosong Formation in the Fenzishan Group is limited to between 21 Ga and 22 Ga. According to rock geochemistry and magmatic zircon Hf isotopic compositional characteristics, the monzogranites formed in the upper crust to some extent partially melted, which is supported by the presence of ~2.4 Ga and ~2.7 Ga inherited zircons, and the older crustal materials is the NeoArchean TTG rocks.