In order to meet the requirement of high-precision measurement of complex river terrain,the Sirius PRO UAV aerial survey system was taken as the research object,and the field survey and accuracy comparison of Fenhe River Basin were carried out.Under the condition of Non-GCPs,a series of data products,such as DOM,DEM and DLG,with a scale of 1:1000 in the measuring area,were produced.The final results were analyzed and the accuracy was compared.The results show that:1:1000 large-scale mapping accuracy meet the requirements of specifications；the efficiency is significantly improved,while other additional digital products can be provided；the results can provide rich and accurate data support for the follow-up design and construction.