Abstract.  In this talk, we introduce some recent progress on hohlraum physics study at IAPCM. Firstly, we present the simulation results from our 2D hydrodynamic code LARED-H on recent hohlraum physics experiments on SGIII prototype. The simulated temporal radiation temperature and radiation spectrum were compared with the observations. The influence of laser intensity on the 2Dhohlraum simulations was studied. The laser x-ray coupling efficiency on SGIII prototype was discussed. Then, we present our new results on the shock wave study, which is usually used in measuring the radiation temperature in a hohlraum, and a scaling relation is used to infer the hohlraum radiation temperature. Our study showed that the scaling relation depends on the temporal profile and the length of the hohlraum radiation, and more than that, the shock velocities produced in an aluminum sample strongly depends on the radiation spectrum. We therefore proposed a novel method for determining the M-band fraction in a hohlraum, by using the responses of x-ray ablative shock waves to Au M-band flux in aluminum and titanium. This method provides a complementary means in determining the M-band flux in a hohlraum. Finally, we present the extrapolated plasma-filling model, which can be used to the case of a hohlraum driven by a shaped laser pulse. This extended model can be used to give a reasonable initial design of the hohlraum size under a given laser pulse, or give a initial design of both the hohlraum size and laser energy to produce a required radiation.