DemoFusion is a high-resolution image generation solution that does not require high costs. By utilizing progressive upsampling, skip residual and expansion sampling mechanisms, DemoFusion extends open-source generative AI models to achieve higher resolution image generation. It boasts user-friendliness, requiring no parameter adjustment or substantial memory, making it accessible to a wide user base. DemoFusion can seamlessly integrate with other applications based on latent diffusion models, enabling controllable high-resolution image generation.