Abstract: According to the inaccurate description of various factors in the traditional information propagation rate model and the high error of simulation results, an information propagation rate model considering propagation speed (PPS) is proposed. First, the model selects the Digg social platform and analyzes the data set; Secondly, a large amount of data is used to improve the calculation method of intrinsic growth rate and user carrying capacity of the traditional model, then the PPS model is obtained according to the different news voting quantity, and finally the simulation analysis is carried out for different coverage stories. The simulation results show that the news on this platform has experienced the growth period and reached the stable period, and the speed of the news is the fastest after the front page is shown. Based on the traditional model and the algorithm, the proposed PPS model has a great improvement in accuracy, which proves that the model is reasonable and effective in analyzing the information transmission rate of the social platform.