利用BESIII已有的和按计划将采集的psi(2S)的数据分析psi(2S)衰变到矢量-赝标-赝标介子三体末态过程，例如 psi(2S)->phi K+ K-；psi(2S)->omega K+ K-；psi(2S)->phi pi+ pi-；psi(2S)->omega pi+ pi-；psi(2S)->phi eta eta；psi(2S)->omega eta eta等衰变道。基于BESIII的大样本数据对这几个衰变道的分支比做精确测量，同时还将进行螺旋度振幅测量，其中最后两个过程分支比是首次测量。还将对这些过程中可能包含的中间态过程进行初步研究，如f2(1270)、sigma等。测量结果有助于检验12%规则，从而揭示psi（2S）的强衰变机制。

Based on the psi(2S) events accumulated and to be taken at BESIII, the decays of psi(2S) to the vector plus two pseudoscalar mesons will be studied, such as psi(2S)->phi K+ K-, psi(2S)->omega K+ K-, psi(2S)->phi pi+ pi-, psi(2S)->omega pi+ pi-, psi(2S)->phi eta eta and psi(2S)->omega eta eta. Using this larger data sample, the measurement on these branching fractions will be improved, and the masurement of helicity amplitude will be performed. It is expected that the last two modes could be observed for the first time, and the possibly intermediate mode, like f2(1270), sigma and so on could be searched for. These results are helpful for testing the 12% rule, and shed light on the strong decay mechanisms for psi(2S).