Abstract. We present recent results on hydrodynamic instability experiments on the HIPER laser facility at Institute of Laser Engineering, Osaka University. We investigated the Rayleigh-Taylor (RT) instability of laser-driven targets under the irradiation condition of future implosion experiments. We observed the growth rate of the RT instability, and related parameters that determine the RT growth rate. Especially, we focused on the measurements of ablation density of the targets, which had not been experimentally measured. The experimental results suggests that the RT growth reduced by non-local electron heat transport, which was also seen in experiments with green laser. The analysis with a one dimensional simulation well agrees with the experimental results.