Abstract: To compare mistletoe diversity,distribution and their associations with the host trees in different habitats,mistletoes and the hosts were investigated using transect survey and roadside survey in four habitats in Xishuangbanna,Southwest China.A total of 17 mistletoe species,two varied species,and one subspecies were identified belonging to eight genera and three families.There were 276 host tree species were found belonging to 170 genera and 61 families.The most general mistletoe species were Dendrophthoe pentandra (infecting 235 host species),Scurrula chingii var. yunnanensis (infecting 86 host species) and Macrosolen cochinchinensis (infecting 46 host species).Mistletoes prefer to distribute in the areas with altitudes below 1500m.Mistletoe infection prevalence and intensity in forests were significantly lower than that of the other 3 habitats (P<0.01),indicated that mistletoes prefer to distribute in the area with low host species diversity and frequently frugivorous bird activities and tend to aggregate in tall trees.The study provides some basic information and cases study for the relationship between mistletoe-host tree and their environment,which will benefit the biodiversity conservation in tropical regions.