An improved predicting of future climate variabilities and changes relies on high-quality data sets from the past, especially the Holocene. The Hangjiahu Plain, which is located in south of the Yangtze River and north of the Qiantang River, a part of the eastern coastal areas of China, is sensitive to the Holocene climate changes. During the Holocene, Hangjiahu Plain occurred transgressive and regressive for many times, and Neolithic sites distribute in this region widely. A drill core of lake-swamp sediment with depth of 4.775 ~ 19.000m was obtained from Beihuqiao (30°22.443'N, 119°56.237'E). The dating data by ~(14)C method indicate that the core spans the period of 11.4 ~4.2cal.ka B.P. Based on 535 color and granularity samples at 2.5cm intervals and 136 total organic carbon (TOC) samples at 10cm intervals, climate and environment during the Early-Mid Holocene was reconstructed. According to the color evolution rule, it can be divided into four stages to discuss (11.4 ~8.7cal.ka B.P., 8.7 ~ 8.0 cal.ka B.P., 8.0 ~5.7cal.ka B.P. and 5.7 ~4.2cal.ka B.P.). The color results were compared with granularity and TOC in each stage,which shows that the yellow degree index (b*) is markedly negative correlating with TOC, the correlation coefficient are -0.663, -0.719,-0.590 and -0.651, so that higher b* indicates lower effective humidity. In addition, in the stabilized water environment, brightness index (L*) is negative correlating with clay, so higher L* infers drier environment. Results of color, TOC, granularity, spore-pollen concentration and E/D (the percentage of evergreen/deciduous) analysis indicate that the study area has undergone significant environmental change. During 11.4 ~8.7cal.ka B.P., in the early of this stage (11.4 ~11.2 cal.ka B.P.)the value of L* (66.01) and b* (12.02) are high but on a declining curve, the percentage of TOC (0.33%) is low but on the raise, showing that the climate was a bit of cold and dry but changing to become warmer and wetter; in the late of this stage (11.2 ~ 8.7cal.ka B.P.) the value of b* has declined 0.73%, the percentage of TOC has increased by 0.2% and the percentage of clay has increased to 30.74%,indicate that the climate gradually turned to warm and wet, and we think that the study area may enter the Holocene Megathermal before 8.7cal.ka B.P. During 8.7 ~8.0cal.ka B.P.,according the lower percentage of TOC (0.37%) and clay (20.03%),the climate turned to steadily dry and cold which lasted about three hundred years in 8.7cal.ka B.P. to 8.4cal.ka B.P.,and from 8.4cal.ka B.P. to 8.0cal.ka B.P.,the percentages of sand is rapidly declined from 7.95% to 0.97%, the spore-pollen concentration and E/D value are increasing rapidly, indicating that the climate was warm and moisture. During 8.0~5.7cal.ka B.P., the lowest average of b* (9.00), the highest percentage of TOC (1.01%) and the fast growing percentage of clay (from 20.03% to 34.33%) show that the climate became warmer and wetter, indicating that this period is the warmest period in the Holocene Megathermal. During 5.7~4.2 cal.ka B.P.,the highest average of b* (12.99) and the rapidly declined of the percentage of clay (25.61%), show that the climate become dryer. During 5.7 ~ 5.5cal.ka B.P. the temperature began to decline and the study area appeared a cold event which lasted nearly two hundred years.