Abstract: The tray discharger in RTS(Rod Transfer System)of COMFLEX-ML linkage system has the shortcomings such as less rigid slide plate, high rate of false detection and lack of overload protection device, which result in high machine failure rate,long downtime and high maintenance cost. Therefore,the tray discharger was modified by adopting steel slide plate,high rating sensor and overload protection device. After improvement,the strength of slide plate and the detection distance of sensor were increased,and the overload protection device automatically cut off the power when overload occurred,which ensured the safety in equipment running. The average failure frequency and maintenance time decreased from 2.7 to 0.5 times/month and from 168 to 12.7 min/time, respectively;the consumption of spare parts reduced as well.