For simple network management protocol (SNMP) not adapt to the requirements of layer-type network running management architecture because of its centralized-thought request reply management approach, the paper proposes the method of predefining managed target hierarchical structure. By building the hierarchical defining model and the uniform managerial information structure of space instrumentation and command network, expanding SNMP managerial station GetInformRequest with the information of predefined hierarchical structure is realized by the software to solve the problem of SNMP not to adapt to the hierarchical architecture. The result shows that the method implements the three-layered management architecture of space instrumentation and command network running management system, and enables the system configuration simple and flexible which meets the requirements of network security of space instrumentation and command network.