将三模压缩算符作用在三模真空态上构建三模压缩真空态。对三模中的两个模进行测量，讨论这种选择性测量对第三模的压缩效应、反聚束效应和光子统计分布的影响。研究结果表明：若测得第一和第二模场处于双模压缩态，那么第三个模场塌缩为单模压缩态，且其压缩效应得到增强；量子态测量可增强光子统计分布的非经典特性，但对第三模场的反聚束效应没有影响。

The three-mode squeezed vacuum state is proposed by using of a new three-mode squeezing operator acting on a three-mode vacuum state. With two of the three modes measured, the influence of the selective measurement on squeezing effect, antibunching effect and photon statistical distribution of the third mode is discussed. The results obtained show that on the one hand, if the first and the second modes are selectively measured in a two-mode squeezed state, the state vector of the third mode collapses onto single-mode squeezing state and squeezing of the third mode is strengthened. On the other hand, nonclassical properties of photon statistical distribution is strongthened by measuring the quantum state, which has no effect on antibunching of the third mode.