Deposition of asphaltene occurs at all stages of the oil and gas production process. Asphaltene depositing in the reservoir will increase the difficulty to product oil and gas， while depositing in the wellbore will plug the wellbore which increases the difficulty of workover. At present，the asphaltene deposition was always predicted by the experimental method which was time-consuming， low efficiency and high cost. Aimed at the shortcomings of the current asphaltene deposition prediction method， based on a large number of researches， a set of asphaltene deposition prediction model and risk rating method was established by simulating wellbore temperature and pressure field and asphaltene deposition phase diagram. A single well in Bohai Oilfield was simulated. The method was quick and easy with high accuracy and no experimental study， and could be used as a quick prediction method for asphaltene deposition， which could provide suggestions for asphaltene damage prevention， judgments and release during oil field development and production.