Human pose estimation (HPE) is a fundamental problem in computer vision, aiming to obtain the spatial coordinates of human joints from images or videos. Despite significant progress, traditional methods often struggle with real-time performance due to their computational complexity. In this paper, we propose a lightweight 3D human pose estimation and visualization system based on the BlazePose+SYS model, which employs an encoding-decoding architecture. Our system can detect human key points and reconstruct 3D human poses in real-time, providing high-precision and real-time solutions for various applications such as action recognition, virtual reality, and sports training. By discarding the heatmap branch during inference, our model achieves lightweight performance suitable for mobile devices and edge computing environments. Experimental results on public datasets demonstrate the effectiveness and accuracy of our system in real-time human pose estimation tasks. This work contributes to advancing the field of HPE by providing a practical and efficient solution.