We welcome the 1st International Conference on Big Data Applications and Services (BigDAS 2015). The aim of BigDAS is to present the innovative results, encourage academic and industrial interaction, and promote collaborative research in big data applications and services worldwide. BigDAS 2015 will be published by ACM Digital Library on ACM International Conference Proceeding Series(ISBN 978-1-4508-3846-2), which will be submitted for indexing by SCOPUS.