In this paper, we investigate a scalar field cosmological model of accelerating Universe with the simplest parametrization equation state parameter field. We use H(z) data, pantheon compilation SN Ia data and BAO to constrain parameters using χ2 minimization technique. obtain present values Hubble constant H0 as 66.2−1.34+1.42, 70.7−0.31+0.32 67.74−1.04+1.24 for H(z), + Pantheon respectively. a...