The ages of the detrital zircons from the Paleozoic Dayixikanghe Formation, Huanghuagou Formation and Hongshuiquan Formation in Fulin area, Great Hinggan Mountains were determined. The results showed that: ① the ages of the detrital zircons from the Dayixikanghe Formation are between 458±4~470±4Ma, and it is according with the Duobaoshan island arc volcanic rocks, which indicates that the Ergun block had not uplifted when the Dayixikanghe Formation deposited during Early—Middle Ordovician; ② the age spectra of the detrital zircons from the Huanghuagou Formation are between 431±4~2227±24 Ma, they are according with a few of hot event time of the Ergun block, also show the Ergun block had uplifted to the earth’s surface and afforded provenance to the surrounded basins, when the Huanghuagou Formation deposited during Early Silurian; ③ the ages of the detrital zircons from the Hongshuiquan Formation are between 283±4~780±7Ma, of which, the age 283±4Ma is according with regional igneous hot event; most ages of the detrital zircons are between 333±3~343±3Ma, also show the deposition age is smaller than 333±3Ma, then the material sources of the crystalline basement of the Ergun block were denuded. In addition, we attempt to make geochemical contrasts the above clastic rocks with the source area of matter.