讨论了激光合成相干叠加态的原理及其性质 ,针对 XY2 型分子 ,证明了合成局域模振动的可行性 ,然后给出相干叠加态的跃迁几率特征 ,发现它仍表现出相干的特性 ,对之进行分析研究表明 ,分子的振动态具有可控性 ,态跃迁几率具有可控性。 The principle and properties of laser coherent superposition state are discussed. For the XY2 molecule, the feasibility of local mode oscillation is proved. Then the transition probability of coherent superposition state is given and it is found that it still shows the coherent property. The analysis shows that the vibrational state of the molecule is controllable, and the probability of state transition is controllability.