Abstract: Aiming at problem that pickup and feeding system of baler was blocked due to winding and accumulation of grass when picking up and feeding grass，and the machine can not work normally，two improvement schemes were put forward by using cutting principle and technical contradiction analysis in TRIZ theory，which could effectively prevent winding and accumulation of grass，avoid system blockage，and then improve picking and feeding efficiency of the baler.Through comparative analysis，scheme of hollow screw conveyor was selected.After improving design of baler prototype，field test verification was carried out.Results showed that effect of preventing blockage of pickup and feeding system was obvious，which fully proved rationality and effectiveness of application of TRIZ theory to improve pickup and feeding system of the baler.