PT XYZ fabricates heat exchangers for power generators and supports government programs related to sustainable development by implementing sustainable manufacturing strategies. The company wants to improve production activities to support their sustainability activities. The purpose of this study is to analyze the results of mapping lean sustainable manufacturing in order to improve the performance of sustainable manufacturing in the company. The initial stage of the research was carried out by measuring sustainability awareness and determining the factors of drivers, barriers, and benefits of sustainability. Next, the current state sustainability value stream mapping (Current- SVSM) was made, which results of manufacturing lead time (MLT) is 1686,626 minutes and process cycle efficiency (PCE) is 54.51%. The next stage is the analysis of the causes of waste using Ishikawa diagram. Sustainability index (SI) indicator was determined and calculated, results 132.3% sustainability index value. The improvements were proposed in the form of regular machine maintenance, application of the Poka-Yoke concept, 5S method and work systems improvement. The results of the Future SVSM are projected to decrease MLT to 1438,881 minutes, increase PCE to 63.89% and decrease SI to 70.7%.