The characteristics of types, homogenisation temperature, capturing pressure of inclusions were studied in reservoir of Upper Paleozoic in northern Ordos Basin. It is indicated that there were a long-range migration and twice accumulations of liquid and gaseous hydrocarbons in Upper Paleozoic reservoir. The paleopressure of inclusions is high in south part, low in north part, and highest in northeast part. The large numbers of nature gas and oil were migrated and were dissipated to the northeast direction after migrating. The hydrocarbons could afford the necessary conditions of formatting the great uranium deposit in Dongsheng based on geochemistry character of uranium.