The Cambrian sedimentary environment and provenance analysis in NW Zhejiang is the key to reconstructing the paleogeography of the SE margin of the Yangtze block, which can provide evidence for the tectonic evolution of the South China Block. Based on the sedimentary facies distribution, paleocurrent direction restored by cross bedding and syndepositional slump folds, and detrital zircon LA- ICP- MS U- Pb dating, the provenance direction and source areas of terrigenous clastics in the Cambrian were comprehensively discussed. The Cambrian strata in NW Zhejiang are mainly composed of carbon siliceous rock, siliceous shale, calcirudyte, sandy limestone,marlstone and mudstone. Sedimentary sequences and facies markers show that the Cambrian strata of the NW Zhejiang are characterized by water- escape structures,slump- folds, flow structures, interformational sliding, syndepositional folds and faults. The Cambrian strata develop olistostromes and carbonate turbidities, indicating that the deposition occurred in deepwater basin and slope environment. The temporal and spatial distribution of sedimentary facies as well as the direction of paleocurrents reflect that the basin deepens to the northwest, and the continental clastic materials of Cambrian mainly came from the southeast, rather than the sedimentary basement inclined toward the southeast judged by paleontological stratigraphy. The Cambrian samples yielded four primary detrital zircon U- Pb age populations of ca. 574 Ma, ca. 747 Ma, ca. 1768 Ma and ca. 2131 Ma, the result of spectrum correlation suggests that the Jiangshan- Shaoxing fault zone and the central Zhejiang area were the main source area, and the terrigenous clastics derived mainly from the Chencai Group, the Shuangxiwu Group, the Heshangzhen Group and the Badu Group. During the Cambrian period, the sedimentary basement inclined toward the northwest, the Zhangli area in the northwest of the basin was the depocenter, and the Cathaysia block emerged above the water as a denuded zone.