High Energy Photon Source (HEPS) will generate a large amount of experimental data for diverse scientific analyses. The traditional method of using local computing environments for data downloading and analysis by users can no longer meet the growing experimental demands. This paper proposes a virtualization-based HEPS cloud desktop system for 3D data imaging and crystal scattering experiments in HEPS. Its features require high-quality image display, high-performance GPU computing, and image rendering, but the experimental site generally lacks these conditions. Therefore, it is particularly important to utilize the resources of a computing cluster to provide a virtual cloud desktop. First, we introduce the basic situation and experimental characteristics of HEPS, as well as the research motivation behind the virtual cloud desktop system. Then, we provide a detailed description of the architecture, service mode, authentication system, GPU usage, and present the design concept of the heterogeneous resource mixed scheduling strategy for the virtual cloud desktop. Finally, we demonstrate the actual application effect of the virtual cloud desktop system in the light source experiment, which highlights its superiority and good prospects in the field of synchrotron radiation sources.