Abstract:

As a new computing paradigm, cloud computing has become a research hotspot in recent years.  Its goal is to dynamically provide reliable, customizable, quality of service（QoS） guaranteed IT computing environment services for users. Discussing this new paradigm from its definition, service levels, pricing model and its future development will help to make a scientific analysis of how to use and operate cloud computing.

Key words: cloud computing, utility computing, scale economy, service levels, pricing model