The rapid development of information technology and the outbreak of the new crown epidemic have dramatically changed the operational issues of global businesses. Both marketing, business models and supply chains have benefited from the application of information technology but were influenced by the disruptions brought about by the epidemic. This book will include three case studies corresponding to three elements of the value chain of operation management: marketing and business model, supply chain logistics. The first paper focus on marketing issues related to live e-commerce. The second paper study the business model of SHEIN, a successful Chinese online fashion company. The rapid development of the internet in China in the 21st century has created an opportunity for the development of cross-border e-commerce. The third article analyzes the maritime industry in Singapore.