Abstract:Research shows that the system must be stable to obtain available parameters X-ray radiation or the crystalline undulator radiation. In the framework of classical mechanics and small amplitude approximation, the effects on the stability by the bent crystals, radiation attenuation, lattice thermal vibration, electronic multiple scattering and nonlinear effect are analyzed. The results show that the stability of the system relates to its parameters, an appropriately adjustmenting parameters, the stability of the system can be ensured.