Due to the more exact environment information it can provide，and its wider application fields，tree ring density analysis，as one of the research methods in Dendroclimatology，has received more and more important attention in environment researches. By analyzing the development process and the new research results of tree ring density measurement technology and tree ring density analysis in the past climate change studies，it is considered that the Xray analysis method is the widely used current measure. The reconstruction of past temperature change based on the tree ring density data is still the main direction of tree ring density researches. Relevant research results indicate that the maximum latewood density of trees in the forest upper limit in the high latitude area are very sensitive to the summer temperature change and thus can be used in the reconstruction of temperature change with several hundreds to thousands of years time scale and different space scales. The earlywood density or the minimum earlywood density has more obvious response to the precipitation and now is mainly used in the reconstruction of regional precipitation change with small scales. Otherwise，the research results of tree ring density analysis can be used in the studies of  the change of climate factors which include the season change，the timing and duration of climate events，influencing factors of regional climate change，dynamic mechanism and abnormal air pressure.