Environmental magnetism is widely used to study environmental change by characterizing magnetic minerals including magnetic mineral assemblage and grain size. Peat deposition contains valuable paleoclimatic history information, yet environmental magnetic study of peat deposition is quite limited. A peat core WDY-2 (122cm in length) was obtained from Wangdongyang Subalpine Peatland (27°40'58"N, 119°38'15"E; altitude in 1300m a.s.l.), Zhejiang Province, China, which is surrounded by low hills with water supplied by atmospheric precipitation. Analyses of magnetic properties, granularity, humification and chronology were conducted on core WDY-2 to explore the environmental meaning of magnetic indexes of subalpine peatland in Eastern China. The results are as follows: (1) Particle-size analysis shows that the sediment of core WDY-2 is mainly composed of clayey silt, consisting on average of 58.3% silt, 25.1% clay, 16.6% sand. Magnetic analysis shows that magnetic properties of core WDY-2 are dominated by ferrimagnetic minerals, together with the contribution of antiferromagnetic minerals. Correlation analysis between magnetic parameters and particle-size shows that SIRM and HIRM are significantly correlated with clay, and S_(_100mT) and S_(_300mT) are negatively correlated with clay. It can be concluded that ferrimagnetic minerals and antiferromagnetic minerals are mainly associated with clay fraction. (2) The index SIRM of WDY-2 can indirectly indicate the strength of hydrodynamic forces. In dry-cold climate condition, there is higher clay content in the sediment that results in higher SIRM value. In contrast, more silt is transported to the peatland in a warm and moist climate that results in lower SIRM value. (3) Climatic changes since 7.6cal.ka B.P. were reconstructed based on the vertical variations of particle size, humification and SIRM values of WDY-2, that is: 7.6~3.6cal.ka B.P.,SIRM is low on the whole which indicates humid-warm climate of Holocene Megathermal, but there are some fluctuations in some phases; 3.6~1.2cal.ka B.P.,SIRM is higher than the first phase, showing that the climate being cold and dry; 1.2 ~0.9cal.ka B.P., a lower SIRM indicates that monsoon rainfall increased dramatically and climate changed dry-cold to humid-warm. The chronology and the climatic characteristics corresponds to the Medieval Warm Period (MWP); 0.9 ~0.4cal.ka B.P.,SIRM presents high level on the whole, but there are some fluctuations. It is suggested that the general trend of climate is dry-cold with some humid-warm stages. The climatic characteristics are roughly corresponding to the Little Ice Age (LIA). 0.4cal.ka B.P. to present, SIRM presents declining trend which shows that climate becomes warm and humid in this stage.