Abstract: S-bandinject-lockingmagnetronexperimentforthegroundmultipactordischargetestwasproposedforthelargepowermicrowavesourceofsatellite.Thedirectlyproportionalrelationbetweenthemagnetroninject-lockingbandwidthandtheinjectionratiowasstudiedbasedontheinject-lockingcontinuouswavemagnetrontheory.Themagnetronoutputpowervariedfrom389Wto1150Wbytuningthemagnetronanodecurrent.TheinjectionlockingbandwidthatSbandofthe1kWcontinuouswavemagnetronwasbroadenedto12.6MHzbyincreasingtheinjectedpower.Dual-frequencyinject-locking，spurioussuppressionandpowerdistributionwereobservedinthetwo-toneinjectionexperiments.

Key words: satelliteantenna, microwavedevice, multipactordischarge, continuouswavemagnetron, injectlocking, lockingbandwidth