Background: Heavy ion reaction is a unique method to investigate the high temperature and density nuclear matter in laboratory

and the radial flow is a very important experimental probe. Purpose: This paper aims to obtain the radial flow and freeze-out temperature and then compare them with experimental results. Methods: By simulating the Au+Au collision at 1 A GeV in the Isospin dependent Quantum Molecular Dynamics (IQMD) framework

the Blast-wave model was applied to fitting the proton transverse momentum spectra and getting the radial flow and freeze-out temperature. Results: Results show that the radial flow decreases from central to peripheral collisions

and the value at central collisions is consistent with the FOPI experimental result and other theory results. Additionally

the radial flow profile ? has been analyzed in details and ?=0.336 has been determined in this work. Conclusion: The Blast-wave model can nicely describe the proton transverse momentum spectra

and give a reasonable radial flow value in comparison with the FOPI and EOS experimental results. Varying the flow profile ? leads to a large change on the shape of proton and deuteron spectra

and the value between 0?1 is supported. Abstract