With the emergence of increasingly abundant power application scenarios,the traditional development mode without operating system for electric energy meters and the functional system with electric energy measurement as the core business can no longer meet the complex and changeable application needs in the future.In order to expand the application of electric energy meters and respond to the international recommendations of OIML IR46 electric energy meters,State Grid Corporation of China proposed the technical standards for the next generation of electric energy meters.The new standard comprehensively optimizes the design scheme of electric energy meter,and puts forward the technical requirements of unified platform,independent development,independent operation and no mutual influence for each functional module.The traditional application management mode of electric energy meter can not meet the requirements of the new standard.This paper presents an application space management method based on watt hour meter operating system,which can realize flexible management and security protection of application software storage space under limited software and hardware resources.