Big Data overall architecture consists of three layers: data storage, data processing and data analysis. Data storage layer stores complex type and mass data, data processing layer realizes real-time processing of massive data, and only through data analysis layer, smart, in-depth and valuable information are got. When talking about big data, it comes to the first is 4V characteristics of big data, namely Volumes, Variety ,Velocity , Veracity. Big data processing key technology generally includes: data acquisition, data preprocessing, data storage and data management, data analysis and mining, big show and application (big data retrieval, data visualization, big data applications, data security, etc.). "Cloud" is virtual computing resources, which realize self maintenance and management, usually in the form of some large server cluster, including computing servers, storage servers, bandwidth resources and so on. Cloud Computing is the fusion and devolopment of Grid Computing, Grid Computing, Distributed Computing, Parallel Computing, Utility Computing, Network Storage Technologies, Virtualization, Load Balance and other traditional computer technology and Network technology. Virtualization, the expansion of the dynamic and scalable, the distributed mass data storage and management, flexible service are main technologies of Cloud Computing. There are still many challenges in Cloud Systems and Platform, Cloud Computing, Database, Virtualization, Reuse and Elasticity Problems. The International Conference on Cloud and Big Data Computing is a premier forum for researchers, practitioners, developers and users who are interested in cloud computing and big data to explore new ideas, techniques and tools, as well as to exchange experience. Besides the latest research achievements, this conference also covers innovative commercial data management systems, innovative commercial applications of cloud computing and big data technology, and experience in applying recent research advances to real-world problems. We solicit original papers on a wide range of cloud computing and big data topics. CBDCom 2015 will be held in Beijing, China.