The lubrication property of microdroplet was researched by using an oil film thickness measuring system of conformal contact.In the experiments,the lubricated contact was composed of stationary microslider plane and rotating transparent glass disc,the film thickness of the lubricants with different viscosity was measured under microdroplet lubrication and fully flooded lubrication.The experimental results show that a droplet of lubricant can be spread on the running track by the rotating disc,and continuous lubrication is then generated,indicating a small quantity of lubricant of microdroplet can supply sufficient lubrication.The film thickness is increased with the increasing of speeds at first and then remains nearly constant when a certain speed is reached.The interferograms show when only a small quantity of lubricant supplied,the contact is not completely supported by lubricant film,and some air and lubricant mixture film appears and may bear some load.