The information dissemination can be affected by social reinforcement effect. Users usually can not receive the information in a short time, and when they do not receive information for a long time, the information dissemination rate will decrease because of the forgetting mechanism. Therefore, it is believed that when information dissemination is affected during the social reinforcement effect, it is also affected by the forgetting mechanism. Information dissemination rates with impact of social reinforcement effect are set as initial values of forgetting mechanism in this study. SEIR model is improved and the transfer of node state in SEIR model is redefined. Simulation results indicate that the larger of time interval for receiving information, the lower of the rate of information dissemination, and the range of information dissemination will be smaller when taking the forgetting mechanism into consideration during social reinforcement effect in social networks.