Wild boar (Sus scrofa) is one of the most widely distributed large mammals in the world. It is one of the main ungulates and the main prey of tigers in the Northeastern Tiger and Leopard National Park. In this study, we summarize the variations of habitat selection and daily activity rhythms in different seasons. We collected camera trap data from May 2015 to April 2016. We used the occupancy model to study the effects of human factors, environmental factors and
wild boar habitat selection. The results showed that the wild boar prefers coniferous forests, conifer- broadleaf forests and high-altitude areas, while avoiding human activities, and frequent grazing and settlements areas. Interspecific interactions had an important impact on wild boar: wild boar will avoid the predator, Amur tiger (Panthera tigris altaica), but the Amur leopard (Panthera pardus orientalis) had a positive impact on it. Two potential competitors, roe deer(Capreolus pygargus) and sika deer(Cervus nippon), had opposite effects in different seasons, suchthat the wild boar deviated from sika deer in winter and deviated from roe deer in summer. Moreover, the daily activity rhythms of wild boar had two peaks in summer and one peak in winter. The wild boar was mainly diurnal and crepuscular and reached the highest peak before sunset in this study area.