Abstract: Aiming at problems such as low drying speed，baling difficulties of scatter hay and grass-roots rotten，a new type of 9LZ-6.0 finger-disc lawn mower was developed to meet market demand and its technical performance indexes could meet design requirements.Flexible adjustment of lawn-wiping device was realized by middle hydraulic system，and lawn-wiping device was folded，turned over and opened in V-shape under automatic control of hydraulic system.Width of grass could be adjusted steplessly，height of tooth tip of grass could be adjusted from ground，and a single grass tray could be modeled independently，and plastic film covering operation could be completed.Through kinematics simulation of main working parts，a field experiment was carried out on prototype.Through analysis of test results and technical indicators，prototype was optimized.Results showed that model was easy to operate，reliable to use，good quality and high productivity，and could meet requirements of forage harvesting in China.