It is an important and basic issue to choose monitoring parameters of Liquid propellant Rocket Engine(LRE) monitoring system in ground test.According to the statistic characteristics of steady parameters and the faults frequently happened in LRE ground test

after analyzing the sensitivity and correlation of monitoring parameters to faults

usability of the sensors and the correlation of measured parameters

the hierarchy models consisting of project layer

criterion layer and object layer for selecting monitoring parameters were established.Based on the Analytic Hierarchy Process(AHP)

and with the help of the models

monitoring parameters to monitor the operation condition of LRE in ground test were evaluated

compared and optimized.Finally

the monitoring parameters were determined.The verification with the test data and simulation data of LRE ground test faults shows that the monitoring parameter set determined can supervise satisfactorily the change of LRE operation condition

and also shows that it is reasonable and practicable to use AHP selected monitoring parameters for LRE monitoring system in ground test.