Abstract: Cube-corner retroreflector is a high precision component, which is often used as a cooperative target of laser rangefinder. The errors of three right angles of a Cube-corner retroreflector influence directly the measurement range and precision of the laser rangefinder. And the analytical result is derived and demonstrated with a large mumber of formulas.The author pointed out that even a small error of any angle can not be neglected during the high-precision measurement.In this paper,the reflecting characteristic of the ideal Cube-corner retroreflector is analyzed with vector expression method. At the same time, the relationship between right angle errors and reflected beam is given by the quantitative analysis.