There is a great potential for energy conservation because of serious energy waste due to the poor management in China. For small and medium enterprises, supervising is one of the main methods to save energy. Energy Management Center (EMC), however, needs a great investment and requires high technique, which sets up a barrier to popularization and application of EMC. This paper provides the application of Internet of Things (IOT), cloud computing and big data to build up a energy use management common cloud platform towards small and medium enterprises. It is convenient and cheap since they only need to install energy consumption information-gathering gateway which sending the data to the cloud without any paying of servers, software and maintenance. The energy management common cloud platform use SaaS (Software-as-a-Service) mode which is also able to save energy by reason of maximizing resource sharing. Moreover, this paper introduces the system architecture and present development situation of energy use management common cloud platform.%由于管理不到位，能源浪费现象很严重，管理层面的节能有很大的节能空间。管理层面的节能主要手段是对能耗实行监管，对中小型企业来讲，采用能源管理中心模式投入较大，技术要求较高，无法获得推广应用。本文提出应用物联网、云计算和大数据等技术，建立面向中小型企业能耗管理“云”服务公共平台，企业无需投入服务器、软件和技术性维护，仅仅需要加装能耗数据采集网关，将能耗计量数据传送到公共云端。公共平台采用软件服务化（SaaS）模式，实现最大化的资源共享，达到节能效果。本文还介绍了中小型企业能耗管理“云”服务公共平台架构和实际应用情况。
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