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We study the evolution of star-forming galaxies with $10^{10}M_\odot<M_*<10^{11.6} M_\odot$ over the redshift range of 0.7<z<1.2 using theemission line galaxies (ELGs) in the extended Baryon Oscillation SpectroscopicSurvey (eBOSS). By applying the incomplete conditional stellar mass function(ICSMF) model proposed in Guo et al., we simultaneously constrain the samplecompleteness, the stellar--halo mass relation (SHMR) and the quenched galaxyfraction. We obtain the intrinsic stellar mass functions for star-forminggalaxies in the redshift bins of 0.7<z<0.8, 0.8<z<0.9, 0.9<z<1.0 and 1.0<z<1.2,as well as the stellar mass function for all galaxies in the redshift bin of0.7<z<0.8. We find that the eBOSS ELG sample only selects about 1%-10% of thestar-forming galaxy population at the different redshifts, with the lowerredshift samples to be more complete. There is only weak evolution in the SHMRof the ELGs from z=1.2 to z=0.7, as well as the intrinsic galaxy stellar massfunctions for lower-mass galaxies of $M_*<10^{11} M_\odot$. There issignificant decrease of the stellar mass function for star-forming galaxieswith redshift at the massive end. Our best-fitting models show that the centralELGs at these redshifts live in halos of mass $M\sim10^{12} M_\odot$ while thesatellite ELGs occupy slightly more massive halos of $M\sim10^{12.6} M_\odot$.The average satellite fraction of the observed ELGs varies from 13% to 17%,with the galaxy bias increasing from 1.1 to 1.4 from z=0.7 to 1.2.

Evolution of Star-forming Galaxies from z = 0.7 to 1.2 with eBOSS Emission-line Galaxies