Oil（hydrocarbon）-bearing inclusions were synthesized in iceland crystal using proven technique by Roedder & Kopp（1975）, which provides an effective approach to probe into forming mechanism of oil（hydrocarbon）-bearing inclusion in carbonatic rock. Through microscopic observation, micro-fluorometry and micro-thermometry work, the main factors which control the forming of oil（hydrocarbon）-bearing inclusion were discussed preliminarily. The pattern of fluid inclusions showed that the quantity of synthetic oil（hydrocarbon）-bearing and aqueous inclusion increased with oil/water ratio decreasing. This demonstrates that hydrocarbons inhibited the healing of crack and the formation of inclusions. The results of micro-thermometry showed that homogenization temperature （Th） values of oil（hydrocarbon）-bearing inclusions were lower than those of brinish inclusions. And companying with the increasing of oil/water ratio, the Th values of oil（hydrocarbon）-bearing inclusions increased. Through pressure correction of Th values of synthetic aqueous inclusions, it could be concluded that trapped temperature of hydrocarbon inclusions could be reflected by that of coexist aqueous inclusions. The experimental results show that oil/water ratio has an important influence on the formation, pattern and Th values of synthetic oil（hydrocarbon）-bearing inclusion. Other factors will be taken for the further consideration in the future work. The conclusions were that growth of crystal and inclusions was constrained by hydrocarbon. The critical period of hydrocarbon charging was correspondent with trapping great quantity of inclusions. The difference of Th between hydrocarbon inclusions and coexist aqueous inclusions increased with oil/water ratio getting higher.