Abstract: The basic design idea of the third-generation onboard measurement,control,management system (Satellite Keeping Operator,SKO) is deseribed.It is a satellite design technology developed based on the concepts of field control,embedded micro-controller and onboard network.Its characteristics include full digital,full network interface,full distributed structure and online-modification.Two concept-changes are put forward embedded and network.SKO is a flexible onboard service system,it coordinates and controls the interaction between onboard devices and equipment with field network,and accomplishes the dynamic operation of the steam of information and energy.Downloading tasks and modifying parameters on-line is convenient.The changes the occlusion and customization of the traditional satellite measure and control system,makes the onboard devices and equipment have the ability of“Plug and Play”.SKO is the crucial technology to construct the onboard-integrated electronics system and the kernel to create the common platform.Using SKO technology,the reliability and validity of the whole satellite are improved,and developing period and cost are reduced.Differences between SKO and OBDH,CAN and 1553B are given.