  We report the discovery of an isolated compact galaxy triplet SDSS
J084843.45+164417.3, which is first detected by the LAMOST spectral survey and
then confirmed by the spectroscopic observation of the BFOSC of the 2.16 meter
telescope. It is found that this triplet is an isolated and extremely compact
system, which has an aligned configuration and very small radial velocity
dispersion. The member galaxies have similar colors and show marginal star
formation activities. These results enhance the opinion that the compact
triplets are well-evolved systems rather than the hierarchically forming
structures. This occasional discovery reveals the limitations of the fiber
spectral redshift surveys in studying such compact system, and declares the
necessity of additional observations to complete the current redshift sample.
