Wuhan China and Borlänge Sweden collaborate to promote sustainable business growths. This thesis, being part of sustainable business project, aims to understand how business can contribute to sustainable development and explore mechanisms of social life cycle assessment. In an effort to answer research questions and further to achieve the general purpose, a BOD online monitor case study is described and analyzed by applying both qualitative and quantitative approaches. Data collection is based on interviews and documents. In the case of BOD online monitor, the thesis identifies Boffin and Universtar companies’ CSR levels. It also observes that SLCA method is able to discover Boffin and Universtar’s social performances at life cycle impact assessment stage and disclose online monitor’s social impacts at interpretation stage. The thesis finally concludes that business’ CSR level can be evaluated from three dimensions: companies’ goals on conducting business, business operation performances and resolved problems. SLCA method is able to disclose enterprises’ social performances, discover underlying factors that might hinder corporations’ ability to contribute to sustainable development and improve product’s social at the same time.