In the era of advanced digital media technology, image technology has been profoundly influenced, leading to the dilemma that artistic modeling faces the mechanical reproduction of images. To explore the contemporary expression of regional theme oil paintings, this study takes the Xizang-themed oil painting School's Out as a practical case. It sorts out the development context of flatness and spatial reconstruction through literature research, compares and analyzes the creative techniques of classic works at home and abroad with image analysis methods, and explores how to construct a visual order in line with contemporary aesthetic trends through the refinement and simplification of geometric figures, the reorganization of spatial structures, and the connection of color relationships, combined with the practice of "flatness and spatial reconstruction" in personal landscape oil painting creation. The research shows that this creative technique can effectively enhance the formal beauty and integrity of the picture, break through the limitations of symbolic expression of Xizang-themed works, construct a visual order with both contemporary aesthetics and spiritual connotations, provide a referenceable practical path for young oil painters, and promote the integration of form innovation and emotional expression in Xizang-themed oil paintings.