Constrained by transistor-technology and algorithm, the bottleneck effect decreases the performance of classical computer, especially with huge dataset or high performance computing. People proposed quantum computer to solve this problem, by calculating with the principle of quantum mechanics in microscale. Due to the breakthrough in experimental physics, several
technology companies released quantum computers for public, for solving some practical problems as well as understanding quantum algorithms better. In this review article, we introduce the basic concept and development process of cloud quantum computing. Plenty of successful applications of cloud quantum computing are presented, and hopefully these would aroused many attentions and enthusiasm.