Big Data has become a new technology which will influence our daily life. It is transforming science, engineering, medicine, healthcare, finance, business, and everything in the society. The CSI Conference on Big Data 2014 (CSI-BIG -2014) provides a leading forum for disseminating the latest research in Big Data Research, Development, and Application. We solicit high-quality original research papers (including significant work-in-progress) in any aspect of Big Data with emphasis on big data science and foundations, big data infrastructure, big data management, big data searching and mining, big data privacy/security, and big data applications. The outcome of successive conferences has been rewarding for professionals from the industry and academia to work together.