Friction exists at the interface between two sliding surfaces.Sometimes,friction is desirable,for example walking.But in most cases,friction is undesirable,which causes materials wear.A simple way to overcome this is using lubricants,which have deeply captured the attention of engineers and scientists for many years.Through evolution,biological systems in nature have developed adaptive friction and lubrication mechanisms during its survival under specific environmental constrains.Learn from nature,can help us to understand fundamental tribological mechanism in biology and then translate them into the development of functional lubrication materials for engineering application.Based on this,a variety of bio-inspired artificial surfaces have been well constructed,including developing low-friction coatings,creation of slippery surfaces with soft matter(polymer brushes,hydrogels,natural macromolecules),building intelligent surfaces with friction control property by integrating responsive polymer onto micro/nano structures.Even so,a number of problems always exist on traditional bionic lubrication materials: such as poor bearing performance,poor antiwear performance and the absence of self-healing property.Research work in our group focuses on the study of biological tribology mechanism in nature,developing ultraslippery surfaces with soft matter and constructing intelligent devices based on friction-control.In nature,many biological systems evolve specific tribology mechanisms during survive,regulated by interface chemical interaction and microstructures.We are extremely curious to explore these mechanisms from the viewpoint of tribology.Further,biolubrication system,for example,the joint,shows ultralow friction coefficient,remarkable wear resistance properties under high hertzian contact pressure.Inspired by this,we develop a series of novel lubrication materials from polyelectrolyte brushes and hydrogels,achieving superior lubrication property and dramatic regulation of friction force from low to high in response to pH,temperature,ions,surfactants,and proteins etc.By grafting these responsive polymer onto bio-inspired nano-and micro-structured surfaces,a novel geckos feet composite material is developed,presents fast friction-switching in aqueous solution.However,both the polyelectrolyte brushes and hydrogels materials are poor bearing performance and antiwear performance.Recently,we developed a novel soft/hard composite material which presents ultra-low coefficient of friction(<0.01)at the MPa level of contact pressure in aqueous solution.This design concept provides a theoretical basis for the development of new implantable joint lubricating materials.Also,we are particularly interested in expanding the other applications of soft matter surfaces with low friction,such as drag-reduction,antifouling,and deicing.Based on these fundamental research results,we are developing novel bionic engineering materials.