Experimental investigation of 0.53m m laser –plasma interaction were conducted on Shenguang–I laser facility, with one of its two beams irradiating on gold disks. The absorption、X –ray conversion、stimulated Raman scattering、hot electrons generation and ions emission were investigated. Experimental results show that absorption and X ray conversion are enhanced, SRS and hot electrons generating were suppressed by shortening laser wavelength in comparision with 1.053μm laser.