The Jiaodong gold province contains more than 4 000 tons of gold reserves and is hence the most important gold-producing area in China. The gold deposits are mainly controlled by the NE-striking Sanshandao, Jiaojia, and Zhaoping faults from west to east, and form three gold metallogenic belts. In order to explore the source of ore-forming fluids in these metallogenic belts, the authors investigated He and Ar isotopes of fluid inclusions in the gold-bearing pyrite form several typical deposits, and the results show that the mean ratio of ³He/⁴He is 1.95 Ra in the Sanshandao belt, 1.74 Ra in the Jiaojia belt, and 1.54 Ra in the Zhaoping belt, with a decreasing trend from west to east. The values of radioactive Ar are 1.17%~87.12% (averagely 33.04%) in Sanshandao, 15.57%~90.00% (averagely 55.75%) in Jiaojia, and 7.94%~92.69% (averagely 44.23%) in Zhaoping, suggesting that the highest contribution of crustal fluids was from Jiaojia, the medium contribution was from Zhaoping, and the lowest contribution was from Sanshandao. Combined with H-O isotopic data, the authors hold that the ore-forming fluids in the Jiaodong gold province were mainly mixed crust-derived and mantle-derived fluids, with possible contribution of meteoric water during the fluid ascending.