探讨了储存环束流的Robinson不稳定性问题，提出用“等效失谐角大于零”取代“失谐角大于零”作为束流稳定的基本条件。在合肥光源电子储存环200 MeV注入状态下，对束流不稳定性与高频腔失谐之间的关系进行了实验测量。结果表明：当束流稳定条件不满足时，如果高频腔大失谐，束流将全部丢失；小失谐时束流容易部分丢失；当高频腔处于负失谐状态，束流流强将限制在较低水平。

The Robinson instability of storage ring is discussed. A new beam stability condition that the equivalent detuning angle should be over zero is presented. The relationship between the beam instability and the detuning of RF cavity is measured during 200 MeV injection at Hefei Light Source storage ring. The results indicate that when the beam stability condition is not satisfied, the beam will be lost if the detuning is large; the beam tends to be lost partially when the detuning is small; in the case of negative detuning, the beam current is limited within a low level.