This　paper　excavates　tourist　decision-making　mechanism　under　the　real-time　tourist　flow　diversion　scheme　(RTFDS)　and　evaluates　the　tourist　flow　diversion　effect　of　RTFDS.　To　meet　the　objectives,　the　stated　preference　survey　and　tourist　flow　survey　of　the　Summer　Palace　were　implemented.　The　tourist　behavior　adjustment　model　and　tourist　flow　diversion　simulation　model　were　established.　The　results　show　that:　(a)　For　core　tourist　spots,　66.5%　and　16.5%　of　tourists　will　choose　＂behavior　adjustment＂　and　＂no　longer　adjustment＂　under　RTFDS,　these　behavior　adjustments　all　shorten　tourists＇　residence　time　in　tourist　spots;　(b)　When　the　tourist　congestion　perception　degree　equals　4　or　5,　tourists　tend　to　adopt　behavior　adjustment　or　the　individuals　adopt　no　longer　adjustment　instead　of　cognitive　adjustment　when　they　face　low　tourist　congestion　perception　degree,　which　equals　1　or　2;　(c)　When　core　tourist　spots＇　residence　time　is　reduced　by　10%　and　20%,　there　are　60%　and　73%　time　nodes　where　core　tourist　spots＇　tourist　flow　density　is　less　than　or　equal　to　the　condition　of　null　information,　there　are　73%　and　60%　time　nodes　where　periphery　tourist　spots＇　density　is　more　than　the　condition　of　null　information.　The　simulation　results　showed　that　some　tourists　could　be　guided　from　core　tourist　spots　to　periphery　tourist　spots　through　releasing　RTFDS　information.　The　research　can　provide　theoretical　support　for　the　implementation　of　RTFDS,　and　alleviate　the　congestion　inside　the　tourist　attraction.　©　2020　by　the　authors.