This paper aims to investigate the effect of a screen cylinder on vortexinduced vibration (VIV) of a circular cylinder and to understand the wake characteristics behind the shrouded cylinder using a high porosity (67%) screen mesh. The diameter ratio between the screen cylinder and the solid cylinder is 2. VIV test is conducted first and phase-averaged analysis is used later to examine the vortex structures at x/d = 5-40 in a wind tunnel. It is found that the screen shroud can suppress VIV by about 78%. Phase-averaged analysis of the shrouded cylinder at a low Reynolds number, however, showed a substantial vortex development with significant strength of the coherent structures.

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