Abstract: This paper presents an enhanced 3D flow visualization algorithm based on the 3D line integral convolution(LIC) and volume rendering techniques.Given an input 3D vector field,a 3D line integral convolution is at first performed to get a spatial-correlated texture.The resulting texture is then filtered with a 1D high-pass filter,resulting in high intensity contrast among the streamlines in the stream surfaces.An importance-driven volume rendering algorithm is employed to depict the interesting regions,and by which the distracting occlusions and visual clutter are effectively eliminated.