has attracted extensive research interests. For example, Das et al. demonstrated that superhydrophobic polymer composite films could be fabricated by hollow-core carbon nanofibers and a fluoroacrylic copolymer. [19] Asthana et al. reported an easy method to fabricate a fluoropolymer/ carbon nanoparticle composite superhydrophobic coating. [16] Bayer et al. showed that the superhydrophobic coating could be achieved by carbon nanotube/fluorinated acrylic copolymer nanocomposites. [18] Although many novel approaches have been introduced, unfortunately, fluoropolymer is usually involved in these methods. [20] Even though some approaches do not include fluoropolymer, they still face the challenge for practical use due to their complex procedures of fabrications or their small-scale fabrications. [21][22][23][24] Thus, it is very important to fabricate large-scale superhydrophobic surfaces with environmentally friendly polymer by a facile method. [25] Here, we report that the superhydrophobic coatings with very low water adhesion can be fabricated by a simple and costeffective approach using polymer/SiO 2 composites. Polybutene (PIB), polyethylene glycol (PEG), and SiO 2 nanoparticles are employed as a material platform, which can produce a microand nanostructure with high roughness, yielding extraordinary superhydrophobic behavior with low water adhesion. When a mixture of PIB and PEG is coated on a glass slide, periodic droplet structured patterns can be easily created on polymer thin films after the removal of PEG, resulting in a microstructure on the surface. Once SiO 2 nanoparticles are coated on this microstructured surface, periodic ring structured patterns are formed on the coating surface, which exhibits superhydrophobic properties with low-adhesive behavior. WCA of the coating can reach up to almost 170°, while hexadecane contact angle (HCA) is only about 5°. Furthermore, water droplet can fully rebound from the superhydrophobic surface.In the present report, we have succeeded in further simplifying the coating method compared with previous studies, [26][27][28][29] which tried to achieve the superhydrophobic surfaces with other facile coating methods. The polymers that we used for coating are commonly available materials and are non-fluorochemicals. [27,28] Our systemized procedures can avoid high temperature and high vacuum treatment which were used in previous studies. [26,28] Our method is not strict to fabricated temperature [29] and can be finished in a relatively short time (≈3 h). Moreover, the coated surfaces are not only superhydrophobic, but also superoleophilic, which is highly potential for oil and water separation application. [27] Our findings here have Superhydrophobicity induced by surface micro-and nanostructure has many important applications in antisticking, self-cleaning, and oil-water separation. Here, a facile method of fabricating periodic droplet structured patterns on polymer thin films is reported. Once SiO 2 nanoparticles are coated on this microstructured film surface, periodic ri...