通过拟合ＹＢａ２Ｃｕ３Ｏ（７－δ）（δ＝０．１，０．４，０．８）和ＰｒＢａ２Ｃｕ３Ｏ７外延膜的室温飞秒瞬态反射谱，研究了其非平衡载流子的超快弛豫动力学，计算了电声耦合常数λ．发现随着氧含量的降低及用Ｐｒ替代Ｙ，Ｃｕ－Ｏ面上载流子浓度降低，非平衡载流子的弛豫时间增加而电声耦合常数明显减小．这表明电声耦合与载流子浓度的依赖关系，电声相互作用可能是一种实空间局域相互作用． By fitting the room temperature femtosecond transient reflection spectra of YBa2Cu3O (7-δ) (δ = 0.1, 0.4, 0.8) and PrBa2Cu3O7 epitaxial films, the ultrafast relaxation of non-equilibrium carriers Kinetics, the electroacoustic coupling constant λ was calculated. It is found that with the decrease of oxygen content and the substitution of Pr with Pr, the carrier concentration on the Cu-O surface decreases and the relaxation time of non-equilibrium carriers increases while the electro-acoustic coupling constant decreases significantly. This indicates that the electro-acoustic coupling depends on the carrier concentration, and the electroacoustic interaction may be a real-space local interaction.