东北虎是温带针阔混交林的旗舰种，历史上广泛分布于中国东北和俄罗斯远东地区，仅仅经过100多年种群数量从上世纪初的2500多只骤降为500只左右，成为濒危物种，从中国东北退到俄罗斯远东锡霍特山脉。面对生境的丧失和退化，中国东北虎种群成功的恢复需要精确的生态需求信息，然而在中国东北虎的基础生态学研究非常匮乏。本研究基于 "中俄边界东北虎及有蹄类动物多样性长期监测平台"，采用红外相机陷阱网络技术，并基于标记-重捕和占据研究的统计和设计框架，全面、系统和准确地探明东北虎种群现状与趋势变化，监测东北虎种群在中国的扩散、定居和繁殖过程；确定家域大小与分析季节性活动节律；估计东北虎的猎物分布与丰富度，并根据粪便和残留食物痕迹分析东北虎的食性和猎物远择；研究东北虎与同域大型食肉动物远东豹之间的共存与竞争机制，系统地回答东北虎的基础生态学问题，为我国东北虎的保护和栖息地的恢复提供科学基础。

The Amur tiger is a wide-ranging feline predator endemic to the temperate broadleaf and mixed forest of north-east China and Russian Far East. The species has suffered dramatic decreases in population and habitat in China, with few tigers straying across the China-Russia borderlands. Currently listed as Endangered under IUCN criteria, the Amur tiger is likely to become extinct unless effective conservation measures are enacted in China. Successful conservation and management require accurate information on ecology of the species upon which decisions can be based. There is an urgent need to conserve tiger and the first step towards this is to obtain knowledge about their basic biology. Little is known about the conservation status of Amur tiger in human dominated forest landscape in China. The occupancy, distribution and tiger density are important information for management and conservation policy formulation. The study based on a field platform on Amur tiger and its prey across the border of China and Russian established in 2007. We use the survey technology of camera-trapping and transect-sampling to determine the amount and distribution of tiger and its prey and habitat associations. The objective is to investigate basic ecological aspects of tigers including the prey availability and selection, food habitats, population and survival rate, home ranges and activity patterns and interaction with Amur leopard, and developed strategies for management and restoration to improve tiger viability in China.