The main objectives of  the present study is to  construct suitable topper unit for topping sugar beet crops using the power unit of the prime mover of Yanmar ARP-8 Rice Transplanter to meet the demands of small and medium farmers in Egypt Tests were conducted at the following topper forward speeds of 1.5, 2.0, and 2.5km/h, topping heights of 1.0, 2.0, and 3.0  (clearance between knife and feeler), and  sugar beet moisture content 35.0, 42.0, and 50.0 % were used. The results showed that by increasing the forward speed from (1.5 to 2.5 Km/h) tends to increase the over topping from (2.90 to 3.22 %), under topping (2.82 to 4.02 %), untopped (3.71 to 4.26 %), effective filed capacity (0.26 to 0.75 fed/h) slip ratio ( 4.0 to 7.9%) and power requirements (2.40 to 6.48 kW), and decreasing the correct topped beet from ( 92.00 to 90.39 %), topping efficiency from ( 96.29 to 95.74 %) and cost for topping operation ( 79.4 to 27.5 LE/fed) .The results also showed that by increasing the topping heights (clearance between knife and feeler) from (1 to 3 cm) leads to increase the topping efficiency (96.29 to 97.23 %), overtopping ( 2.50 to 3.22%) and decrease the under topping (4.02 to 2.60 %), and untopped beet (3.71 to 2.77 %).