The past two millennia is a critical period for understanding the factors responsible for the variability of the global climate system. The reconstruction of high-resolution temperature and precipitation sequences during the past 2000 years in many regions of China has been carried out using climate proxy records, such as historical documents, tree rings, pollen, corals, lake sediments, stalagmites, ice cores, and so on. However only limited such studies have been restricted in the Daxing'an Mountains due to the lack of suitable climate proxy records, while this region is a key area for studying global climate changes given its location in boundary zone of the monsoon climate. This study is based on a pollen record of the 88-cm long MG peat profile located 20 km north of Mangui town in the northern Daxing'an Mountains (52°17'39. 88"N,122°08'40. 07"E; 665 m a.s.1). The modern meteorological parameters of the site are obtained by spatial interpolation of 30-year average meteorological data of nearby stations : annual mean temperature -4. 6 ℃,annual precipitation 455. 4 mm, January mean temperature-29. 5 ℃,and July mean temperature 17. 2 ℃. A total of 831 surface pollen samples and the 30-year ground observation data of 90 meteorological stations are used in the Modern Analogue Technique ( MAT) to reconstruct the annual mean temperature ( T_(ann) ),annual precipitation ( P_(ann) ),January mean temperature ( T_(jan) ) and the July mean temperature (T_(july)) for the past 2100 years in this region. The results reveal regional climate change during the past 2100 years : the T_(ann) fluctuates between -3. 1 ℃ and - 5. 5 ℃ with the average value of - 5. 10. 3 ℃; the T_(jan) fluctuates between - 27. 4 ℃ and - 29. 8 ℃ with the average value of - 29. 40. 4 ℃; the T_(july) fluctuates between 15. 9 ~17. 6 ℃ with the average value of 16. 40. 2 ℃; the P_(ann) varies between 471. 3 mm and 499. 5 mm with the average of 479. 34. 2 mm. The climate change of the past 2100 years can be divided into three stages. Stage I( 150 BC ~850 A. D. ) : the temperature and precipitation were relatively low, and the T_(ann) was about 0. 5 ℃ lower than the modern 30-year mean. Stage II (850 ~1300 A.D.) : temperature fluctuation occurred and marked temperature rose during the period 1070~1170 A.D. with the T_(ann) of -4. 40. 2 ℃,which is about 0. 2 ℃ higher than the modern 30-year mean. This stage is referred to the European medieval climate anomaly ( MCA). Stage Ⅲ ( 1300 ~2000 A.D.) : the period 1300 ~1900 A.D. correlating with the Little Ice Age (LIA) was characterized by lower temperature with the T_(ann) of - 5. 4 0.2℃,which is about 0. 8 ℃ lower than the modern 30-year mean. However the temperature show a warming trend since 1900 A.D.