In recent years, arti cial intelligence (AI) has aroused much a ention among both industrial and academic areas. However, building and maintaining e cient AI systems are quite di cult for many small business companies and researchers if they are not familiar with machine learning and AI. In this paper, we rst evaluate the di culties and challenges in building AI systems. en an cloud platform termed XCloud, which provides several common AI services in form of RESTful APIs, is constructed. Technical details are discussed in Section 2. is project is released as open-source soware and can be easily accessed for late research. Code is available at h ps://github.com/lucasxlu/XCloud.git.