SFR versus stellar mass of the galaxies in our simulations at the epoch z ∼ 5 (left) and z ∼ 2 (right). The filled circles are our simulation results and the plotting colors distinguish results from different runs. The observational results of SFR versus stellar mass relation are indicated for star-forming galaxies at z = 4, 5, 6 (Salmon et al. 2015) as solid lines and galaxies in different redshift bins within z = 1.3 − 6 (Santini et al. 2017) as dashed lines with square plotting symbols.