Abstract: A new kind of laser direct driven quasi-isentropic compression experiment of aluminum without the temporal pulse shape was performed based on the long-pulsed KrF excimer laser. According to the simulated results, matched design of the laser and target structure was carried out. It’s demonstrated that ramp loading in aluminum foils is at pressure of 16.8 GPa with rise time of about 17.0 ns. The peak pressure was well reproduced by the 1D radiation hydrodynamics simulation. The stability and repeatability of HEAVEN-Ⅰ laser facility were verified. Through analyzing the damage morphology and microstructure of recovered sample, it shows that aluminium coating completely gasified in irradiated area, and lots of aluminium deposited on the edge of irradiated area. The phase structure in recovered sample is the same as the initial one, which implies that there are no new materials generated. Finally, to make the effect of the pulse intensity clear, quasi-isentropic compression process was calculated by 1D radiation hydrodynamics simulation. The entropy production was obtained based on law of thermodynamics, and some disciplinary conclusions were drawn.