Reservoir architecture research and 3D geological modeling are of great significance for reservoir fine description and remaining oil exploration. Taking Donghe sandstone shore reservoir in Hudson oilfield as an example, this paper established the modeling method of sandy shore reservoir architecture. At home and abroad, there is little research on the architecture of shore facies reservoir, and there is no mature research method for its architecture modeling. At the same time, Donghe sandstone reservoir in this area has the characteristics of large buried depth and thin reservoir, which increases the difficulty of geological modeling. In view of the above problems, first of all, GR and DEN curves are selected by using coring well data to classify and identify the architecture interface of shore facies reservoir. Taking the sedimentary genetic model as the constraint condition, the architecture model is determined. By using the method of combining vertical well with horizontal well, the quantitative relationship between the thickness and the extension length in the direction of parallel and vertical paleoshoreline is obtained. Under the constraints of architecture model and quantitative formula, a multi-level coupling method is used to establish a 3D geological model. The results show that the third-order and fourth-order configuration interfaces play a major role in controlling oil and water. The extension length of the fourth-order architecture interface is 516-4560m parallel to the paleoshoreline, 439-2549m vertically, and the length-width ratio is 1.8:1; The extension length of the third-order architecture interface is 344-1509m parallel to the paleoshoreline, 265-974m vertically, and the length-width ratio is 1.7:1. It is proved that the architecture model established by this method has the advantages of strong rationality and high reliability.