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We present a multiple emission lines study of $\sim$1300 H$\alpha$ emitters(HAEs) at $z \sim 2.3$ in the ZFOURGE survey. In contrast to the traditionalspectroscopic method, our sample is selected based on the flux excess in theZFOURGE-$K_s$ broad-band data relative to the best-fit stellar continuum. Usingthe same method, we also extract the strong diagnostic emission lines for theseindividual HAEs: [OIII]$\lambda\lambda4959,5007$,[OII]$\lambda\lambda3726,3729$. Our measurements exhibit good consistency withthose obtained from spectroscopic surveys. We investigate the relationshipbetween the equivalent widths (EWs) of these emission lines and various galaxyproperties, including stellar mass, stellar age, star formation rate (SFR),specific SFR (sSFR), ionization states (O32). We have identified a discrepancybetween between HAEs at $z\sim2.3$ and typical local star-forming galaxyobserved in the SDSS, suggesting the evolution of lower gas-phase metallicity($Z$) and higher ionization parameters ($U$) with redshift. Notably, we haveobserved a significant number of low-mass HAEs exhibiting exceptionally high$EW_{\mathrm{[OIII]}}$. Their galaxy properties are comparable to those ofextreme objects, such as extreme O3 emitters (O3Es) and Ly$\alpha$ emitters(LAEs) at $z\simeq2-3$. Considering that these characteristics may indicatepotential strong Lyman continuum (LyC) leakage, higher redshift anaglogs of thelow-mass HAEs could be significant contributors to the cosmic reionization.Further investigations on this particular population are required to gain aclearer understanding of galaxy evolution and cosmic reionization.

Multiple emission lines of H$\alpha$ emitters at $z \sim 2.3$ from the broad and medium-band photometry in the ZFOURGE Survey