This study apply LA-ICP-MS to date the U-Pb age of detrital zircons from the Chentangwu Formation, Pingshui Group in Pujiang County, Zhejiang Province, and obtained the youngest peak age at (828±3.8 Ma), represent the lower limit of the ages of deposition of this suite of rocks. Based on this age, coupled with the SHRIMP U-Pb age (825.3±8.1 Ma) and (830±6 Ma) of the tuff from the Chentangwu Formation, the age of Pingshui Group in Pujiang County is limited to middle neoproterozoic, and just above the Shuangxiwu Group in Fuyang area and the Pingshui Formation in Shaoxing area. The Pingshui Group in Pujiang County is a sequence of weakly deformed, low grade metamorphic marine volcanic lava, volcaniclastic rock and sedimentary pyroclastic rocks, Skeleton particle statistical results of the Chentangwu Formation show that volcanic fragments adds up to 60%~80%, sedimentary lithic fragment adds up to 10%~30%, feldspar adds up to 15%~20%, and that quartz is rare, the average content is 5%, it is subangular, and with poor sorting and rounding, these features all show the characteristics of proximal volcanic eruption, the source is from volcanic arc, and its sedimentary rock has abundant 850~800Ma detritus zircons without ~1000Ma or older ones, show that the volcanic fragment of the Chentangwu Formation derived from the volcanic rocks that almost the same period of sedimentation, this also suggests the Pingshui Group form in an area which near the new magmatic arc. Both the time and space and structural properties, the Pingshui Group in Pujiang County and the Shuangqiaoshan Group show the corresponding arc—basin system, suggest that they have some causal association.