In the history, Water Deer (Hydropotes inermis) distributed widely in the Liaodong Peninsula, the North China Plain and the Yangtze River in China. Since 1949, no record any recorde of the water deer has been reported in Jilin province. The discovery of the water deer has been reported for several times in Jilin province in recent years. Then we carried out an infrared cameras survey in Jilin Baishan Musk Deer National Nature Reserveand during December 2017 to March 2018. Totally, 21 photos and 600 seconds video on the water deer were taken (Table 1 and Fig. 1b﹣d). In the subsequent studies, a fawn (Fig. 1e) and a large amount of the traces (Fig. 1f) were photographed in the field. It proved that water deer was existed in Jilin province.