叙述了在“ＫＡＯＮＦａｃｔｏｒｙ”Ｂｏｏｓｔｅｒ腔的Ｒ＆Ｄ工作中，用平行式偏磁铁氧体调谐实验腔进行的模式测试和阻尼的实验结果，表明结构形状复杂的同轴腔，有十分丰富的高次振荡模式，基模有复杂的场分布。在腔的适当位置放置铁氧体介质，对除基模外的各种寄生模式均有良好的阻尼作用。利用适当设计的谐振环路，亦可对特定频率的危险寄生模，进行有效的阻尼。 The experimental results of the mode test and the damping experiment in the KAONFactory Booster cavity for R & D work are shown. The results show that the coaxial structure with complex structure has a very rich high-order oscillation mode The fundamental mode has a complex field distribution. Placing a ferrite medium in the proper place of the cavity provides good damping of various parasitic modes except for the fundamental mode. With appropriately designed resonant loops, it is also possible to effectively dampen dangerous parasitic modes at specific frequencies.