CaCO3 nanoparticles were modified from hydrophilic to hydrophobic with oleic acid, hydrophobic coating was formed on the glass substrates with modified nanoparticles and polydimethylsiloxane via a simple process. The surface wettability and topology of coating were studied by contact angle measurement and scanning electron microscopy. The experimental results showed that the coating exhibited self-cleaning property with a water average contact angle of 160 degrees and sliding angle of 6 degrees, coating surface with hierarchical nano and micro structures, this method has good prospect for applications. (C) 2012 Elsevier B.V. All rights reserved.