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The report of the 19th Congress of the Communist Party pointed out that it is necessary to accelerate the construction of manufacturing power and promote the deep integration of the Internet,big data,artificial intelligence,people’s livelihood,and the economy.Under the current background of economic transformation and consumption upgrade,peoples’ daily lives have increasing demands for information,network,and intelligence.The intelligent home industry suddenly has an amazing and huge market.At the same time,2019 is the first year of China’s commercial 5G.5G technology has characteristics of fast speed,high stability,and low error rate,which meets the requirement of intelligent homes for fast and stable network.With the arrival of 5G technology,the Internet of Things technology and intelligent home technology will also face a new rapid development.Currently,most of the intelligent home systems are controlling the devices by infrared ray,which has many shortcomings like large external disturbances,unable to penetrate the obstacles,and it is hard to control remotely,etc.In addition,most of the intelligent home system has just realized the control and status supervision of the devices,but less of them can provide user-defined scenarios or face the problem of providing a single scenario.For device control,few intelligent home systems can implement user authentication and authorization operations for controlling a specific device.Therefore,based on the discovery problems,it is of great significance to design and realize a intelligent home system.Based on the functional and non-functional analysis of the intelligent home system,this paper designs and realize a intelligent home system based on MQTT protocol.This paper analyzes the design principles and functional demands of the intelligent home gateway in detail,and on this basis,this paper also designs the overall architecture of the system.This project uses a sub-modular design philosophy to design the system framework and divides the clients into several modules such as gateway management,device management,scenario mode,recycle bin,and position monitoring.And then,through the function analysis of each module,the design of the database table and the back-end service interface are completed,and the code is realized.Finally,the functional and non-functional tests are conducted for the completed server and client,and the problems in the test are repaired.This paper is from the cooperation project "Intelligent Home System Project" between Beijing University of Posts and Telecommunications and Huizhou Liangxin Intelligence Technology Co.,Ltd.,and realize a intelligent home system with supporting multiple scenarios,remote supervision and control,gateway device authorization,and strong security.This paper will mainly introduce the specific design and function implementation of this system.This system has been commercialized and achieved a good economic and social value.