The phenomenon of glue stack is easy to appear at the turning and the height drop when the surface workpiece is coated.In order to achieve uniform gluing in the application of high quality glue line and high requirements of appearance and shape, according to the actual production of gluing,a gluing robot and asurface gluing test platform were built.Orthogonal experiments of freeform surface precise gluing were designed to get the glue line under different gluing conditions.The quality of glue line was quantitatively analyzed and evaluated by using the statistical method, and the quality model of the glue line was established.The results show that the width and height of theglue line can be well controlled by controlling the glue speed and height; the established quality model of glue line has high reliability and can meet the requirements of precise coating.The research results provide basis for the design of robot freeform surface coating scheme and provide theoretical and practical guidance for the realization of precise coating.