M?ssbauer effect has become a necessary tool in the study of hyperfine interactions since it was discovered. But the application of this technique was restricted by several factors such as the recoil-free factor and the lifetime of the M?ssbauer precursor isotope. With the development of the radioactive nuclear beam techniques

dozens of short life M?ssbauer precursor isotopes were discovered. After educed from the Isotope Separator On-Line (ISOL) facility

the M?ssbauer precursor isotopes were implanted into the samples

and then the M?ssbauer spectra were recorded on-line. The on-line M?ssbauer spectrometers have been established on many ISOL-type radioactive facilities (such as CERN

RIKEN) all over the world. In this paper a test bench of on-line M?ssauber spectrometer is introduced.