The Lower Cretaceous Qingshuihe Formation in SN 31 well area in the Xiayan uplift of Junggar Basin is dominated by a set of interbedded sandstones and mudstones. Prior to this investigation, few studies had been carried out on the sedimentary facies and provenances. Based on the core observations，logging curves and analytical and testing data，the provenance was determined according to the clastic content，the thickness distribution of conglomerates，heavy mineral ZTR index and mudstone color zoningThe results show that the provenance during the deposition of the Member 1 of the Qingshuihe Formation in SN 31 well area is not a single one，while it   changed with time. The clastic content of the No1 interval  of the second sand zone of Member 1 of Qingshuihe Formation and the No3 interval  of the first sand zone indicated that the sediments were mainly derived from the southeastern and the northern provenances. During the deposition of the No1 interval  of the first sand zone，the provenance changed greatly. The southeastern provenance disappeared and its disappearance was mainly due to the tectonic movements during the late depositional period of the Member 1 of Qingshuihe Formation, which led to the topography changing from the earlier south higher and north lower topography to the north higher and south lower topography. The thickness distribution of conglomerates and heavy mineral ZTR index analyses also show similar characteristics. During the deposition of the Member 1 of Qingshuihe Formation，two main provenances existed in SN 31 well area. One is the southeastern source area and the other is the northern one. The two provenances had their own affecting regions. The impact of the northern provenance gradually increased and dominated the whole study area in the late period，while the southeastern provenance mainly had its controlling influence in the early period and disappeared in late period.