OH超脉泽（OHMs)是一类非常重要的河外超脉泽，通常与亮红外星系成协，与寄主星系中的星系并合，星暴过程等有密切联系，是研究这些未知物理过程重要探针。高灵敏度、高分辨率VLBI观测是研究这类超脉泽结构和动力学性质的主要手段。由于OHMs比较弱，目前只有少量的源做过VLBI观测，这使得人们对这类源的结构、物理环境、星暴、星系核活动及演化过程等的了解十分有限。该项目计划对小样本OHMs进行VLBI观测研究，目前已完成6个OHM样本的部分VLBA观测，并期待能够得到更多样本源的VLBI（如EVN+上海65米）观测，从而更好的研究OHMs与寄主星系的物理联系，推断并合、星暴过程的物理环境，气体动力学等。该项目同时参与FAST有关团组开展VLBI系统测试，与国内天线单基线的实验观测等。在此基础上开展基于FAST的OH超脉泽的更高灵敏度VLBI观测预研究。

OH megamaser(OHMs) are a kind of important megamaser in the Universe, they are.usually found in Luminous IR Galaxies(LIRGs), their formation are associated.with larger star formation, galaxy interactions and so on. The high.sensitivity and high resolution VLBI is a key technique for studying .the properties of OHMs and their host galaxies. While there are only. a few sources that have been studied by VLBI observations by now .due to their low flux density, our project plans to use VLBA to .observe a small sample of OHMs. It is expected to use Shanghai .65m+EVN in the near future. The VLBI observations includes .the emission line and radio continuum which will help us understand. the environment of the formation of OHMs and the properties .of luminous IR galaxies. We are going to take part in the FAST .VLBI team to do some technique researches on FAST+VLBI .observations and experiments, which can help us try observing OHMs in the near future.