Opportunities and challenges faced by digital libraries in the era of big data

With the rise of academic resource database vendors in the big-data era,several important vendors in China,such as CNKI,Wanfang,Weipu and Superstar database as well as some onlineresource vendors,such as Baidu,are developing rapidly in the resource construction in respect to the academia,education and culture.These resource construction vendors are continuously expanding their information resources and at the same time diversifying the forms of service.