The product is used for lubricant agent for drilling fluid, and it has high temperature capability and salinity tolerance and excellent lubricant performance, and it is innocuous and harmless and it is easy to be degraded, and it has very low florescence interferes. It has good compatibility with kinds of drilling fluid and has no bad effect on the rheology behavior for the drilling fluid. It is an excellent lubricant agent for exploratory well, inclined well, information well and producing well.