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Green Pea and Blueberry galaxies are well-known for their compact size, lowmass, strong emission lines and analogs to high-z Ly{\alpha} emitting galaxies.In this study, 1547 strong [OIII]{\lambda}5007 emission line compact galaxieswith 1694 spectra are selected from LAMOST DR9 at the redshift range from 0.0to 0.59. According to the redshift distribution, these samples can be separatedinto three groups: Blueberries, Green Peas and Purple Grapes. Optical[MgII]{\lambda}2800 line feature, BPT diagram, multi-wavelength SED fitting,MIR color, and MIR variability are deployed to identify 23 AGN candidates fromthese samples, which are excluded for the following SFR discussions. We performthe multi-wavelength SED fitting with GALEX UV and WISE MIR data. Color excessfrom Balmer decrement shows these strong [OIII]{\lambda}5007 emission linecompact galaxies are not highly reddened. The stellar mass of the galaxies isobtained by fitting LAMOST calibrated spectra with the emission lines masked.We find that the SFR is increasing with the increase of redshift, while for thesources within the same redshift bin, the SFR increases with mass with asimilar slope as the SFMS. These samples have a median metallicity of12+log(O/H) of 8.10. The metallicity increases with mass, and all the sourcesare below the mass-metallicity relation. The direct-derived Te-basedmetallicity from the [OIII]{\lambda}4363 line agrees with the empiricalN2-based empirical gas-phase metallicity. Moreover, these compact strong[OIII]{\lambda}5007 are mostly in a less dense environment.

Strong [OIII]{\lambda}5007 emission line compact galaxies in LAMOST DR9: Blueberries, Green Peas and Purple Grapes