This report delves into the Just-in-Time (JIT) production system, specifically examining its application within Toyota Vietnam. It begins with an introduction to the JIT concept, outlining its core principles, operational mechanics, advantages, and disadvantages. The report then provides a detailed case study of Toyota Vietnam, exploring the historical context of its establishment and the evolution of its production processes. Key aspects covered include the implementation of JIT, production turning points, and the strategic application of the JIT system within the Toyota Group's operations. The methodology section outlines the framework used for analysis, including data collection and forecasting techniques. Finally, the report examines inventory management strategies employed by Toyota Vietnam. The conclusion summarizes the key findings and offers insights into the effectiveness of JIT in the context of Toyota Vietnam's manufacturing practices.