Ring effect is defined as the phenomenon that the depth of solar Fraunhofer lines in scattered light is less than those observed in direct sunlight. And today it is commonly agreed that rotational Raman scattering on atmospheric molecules is the dominant source for the Ring effect. The Ring effect is affected by the optical properties of aerosol. And thus the aerosol information can be retrieved from the measured strength of the Ring effect. A novel method is presented to simulate Ring effect based on the Monte Carlo atmospheric radiative transfer model (McArtim). The average probability of photons that have undergone rotational Raman scattering (RRS) event is calculated under different atmospheric situations, which represents corresponding strength of Ring effect. A comparison of the results of Ring effect between simulation and measurement with MAX-DOAS shows a good agreement. The result indicates the Ring effect can be calculated rapidly with radiative transfer model. The simulation technique can be combined with the MAX-DOAS measurement to retrieve the properties of aerosols in the future.