The ultra-slippery surface is fabricated by infiltrating functionalized micro/nano surface structures with low-surface energy, chemically inert lubricating oil. The lubricating oil is locked by micro/nano structures due to the capillary effect, and a dynamic oil film is formed on the surface. Therefore, the liquid-solid interface is replaced by liquid-liquid interface, leading to the significant reduction of flow resistance. Compared with traditional superhydrophobic surfaces and superoleophobic surfaces with similar low sliding angles, air trapped in the pores is replaced by the lubricating oil, which can provide better pressure stability. Furthermore, ultra-slippery surfaces possess appealing self-healing ability due to the capillary flow of lubricating oil. Because of these significant advantages, recently they have drawn much attention and become a research focus all over the world. So far ultra-slippery surfaces have been investigated for various applications such as anti-icing, heat transfer enhancement, drag reduction, anti-biofouling, microfluidics, etc. However, there are still some important challenges which limit their applications, for example, how to avoid or alleviate the performance deterioration caused by the evaporation of lubricating oil, and how to choose proper process to fabricate various micro/nano structures on different kinds of material. This paper reviews the recent progress of the fabrication and applications of ultra-slippery surfaces, discusses the existing problems, and provides outlook of development tendency.

Contents
1 Introduction
2 Design principles of SLIPS
3 Fabrication technologies of SLIPS
3.1 Overview of fabrication methods
3.2 Chemical reaction
3.3 Spray coating
3.4 Self-assembly fabrication
4 Applications of SLIPS
4.1 Anti-icing application
4.2 Heat transfer enhancement
4.3 Pipeline transportation
4.4 Droplet manipulation
4.5 Marine anti-biofouling
4.6 Bioengineering application
4.7 Sediment removal
5 Conclusion