Under four sets of parameters, the effect of event start time t (t∈[0,100]) and event competition effect I (I∈[0,1]) on net effect on the total infected rate of the event. In all cases we always set the information dissemination rate κ=0.15, the information decaying rate κ’=0.2 and the infection reduction rate η=0.85. For the image processing, the Gaussian smoothing algorithm with σ=1.5 was used.