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This article reports a sample of 1830 strong [O III] {\lambda}5007emission-line compact galaxies discovered with the LAMOST spectroscopic surveyand the photometric catalog of SDSS. We newly identify 402 spectra of 346strong [O III]{\lambda}5007 emission-line compact galaxies by finding compactisolated point sources. Combined with the samples in our previous work (Liu etal. 2022), this returns a sample of 1830 unique strong [O III]{\lambda}5007emission-line compact galaxies with 2033 spectra of z <= 0.53. For the sourceswith 2{\sigma} [OIII]{\lambda}4363 detections, we calculate the gas-phasemetallicity with the direct-Te method, and verify that the strong-linemetallicity diagnostics calibrated with the direct-Te method also applies tothis sample. The strong [O III]{\lambda}5007 emission-line compact galaxiesfall below several Te-calibrated mass-metallicity relations. The N/Omeasurements of the strong [O iii]{\lambda}5007 emission-line compact galaxiesmainly locate at a plateau at low metallicity, indicating the product ofprimary nucleosynthesis. The Ne3O2 and O32 relation follows a tight linearrelation with no redshift evolution. The Ne3O2 anti-correlates with the stellarmass, and at fixed stellar mass the Ne3O2 increase with the redshift. Eightsources with asymmetric [O III]{\lambda}5007 emission-line profiles have beenidentified, however with no [O III]{\lambda}4363 detection, which proves therich metal content and complex ionized gas kinematics within the galaxies.Higher-resolution spectroscopy will be necessary to identify the ionized gascomponents in detail.

Ionized gas metallicity of the strong [OIII]{\lambda} emission-line compact galaxies in the LAMOST survey