Studies on plants such as lotus leaf suggested that dual-scale structure could contribute to super-hydrophobicity. We introduced super-hydrophobicity onto poly(ethylene terephthalate)(PET) fabric with dual-scale structure by assembling <TEX>$TiO_2$</TEX> nano sol. PET fabric was treated with <TEX>$TiO_2$</TEX> sol, water-repellent agent using various parameters such as particle size, concentration. Morphological changes by particle size were observed using field emmission scanning electron microscopy(FE-SEM) and AFM measurement, contact angle measurement equipment. The contact angle of water was about 138.5<TEX>$^{\circ}$</TEX>, 125.8<TEX>$^{\circ}$</TEX>, 125.5<TEX>$^{\circ}$</TEX> and 108.9<TEX>$^{\circ}$</TEX> for PET fabric coated with 60.2nm, 120.1nm, 200nm and 410.5nm <TEX>$TiO_2$</TEX> particles, compared with about 111.5<TEX>$^{\circ}$</TEX> for PET fabric coated with water repellent. When we mixed particle sizes of 60.2nm and 120.1nm by 7:3 volume ratio, the contact angle of water was about 132.5<TEX>$^{\circ}$</TEX>. And we mixed particle sizes of 60.2nm and 200nm by 7:3 volume ratio, the contact angle of water was about 141.8<TEX>$^{\circ}$</TEX>. Also we mixed particle sizes of 60.2nm and 410.5nm by 7:3 volume ratio, the best super-hydrophobicity was obtained. In this paper, we fabricated various surface structures to the water-repellent surfaces by using four types of <TEX>$TiO_2$</TEX> nano-particles, and we found that the nanoscale structure was very important for the super-hydrophobicity.