By introducing the concepts

requirements

related standards and work of grid monitoring

some actual monitoring systems were analyzed;expounded the monitoring requirements and their relations

found some problems and deficiencies in grid monitoring.Based on the R-Net grid computing test platform

RNMS（R-Net monitoring system） used some technology such as adaptive sensor control

on-demand measurement

distributed directory service

node group management

mixed data format

which improved the interoperability and scalability

reduced the intrusiveness.Based on the RNMS

an alarming system was designed without more modifying.It shows the RNMS has a good scalability.