Temperatures of two hot springs around the Changbai Mountains volcano (NE China) have simultaneously increased about 3℃ since May 2010. Moreover, the altitude of northern slope of the Changbai Mountains volcano cone decrease about 12.72mm in 2010 whereas it increases around 4mm/a before 2009. This study preliminarily discusses the possible reasons for occurrence of above observations and precludes a link to the active phase of the Changbai Mountains volcano in the near future. Changbai Mountains volcano has entered into a quiescent episode since 2005 and the emitted gases began to immigrate to the N2 apex. The variation of He concentration in the emitted gases reflects the characteristics of gas composition evolution in magma chamber.