Abstract: In the two-step cold crucible induction melting vitrification process, high-level radioactive waste is evaporated, denitration, and calcined in the calcination furnace firstly, ultimately becoming a metal oxide calcined material with a certain size. Then the calcined material falls into the cold crucible induction melting, it will form a glass solidified product together with the basic-glass beads through the transfer device at the tail of the furnace. It has certain acceptance requirements for the moisture content and nitrate decomposition rate of calcined materials during melting process, and in order to facilitate calcinated product transportation and reduce material loss, the particle size, packing density, and entrainment amount of the calcined material also need to be controlled within a certain range. This work focuses on the calcination process of simulated high-level radioactive waste(HLW) in a power reactor with a fuel consumption of 55 GWd/tU. Some process parameters have been confirmed based on the previous laboratory research results. However, it was found that the calcinate particles were too fine and the bulk density was too low, which could lead to blockage of the calcination furnace head during long-term operation in engineering applications. In order to solve this problem, the research group conducted a study on the effects of sucrose additive amount and calcination temperature on the properties of calcined materials. The moisture content, bulk density, and particle size distribution of the calcined material were measured, the XRD, XRF, and free nitrate concentration of the calcined material were analyzed. The experimental results show that excessive sucrose addition can lead to a decrease in the average particle size and bulk density of calcined materials, exacerbating the entrainment phenomenon. Too little sucrose will slightly lower the decomposition rate of nitrate in calcined materials. At the current calcination temperature, the sucrose addition amount is appropriate at 10-30 g/L. When the amount of sucrose added is 20 g/L, reducing the calcination temperature will increase the bulk density of the calcined material and reduce the entrainment during the calcination process, but it will also lead to an increase in water content and incomplete decomposition of nitrate. Taking into account the properties of the calcined material such as moisture content, bulk density, particle size, entrainment, and nitrate decomposition, the recommended process temperature for the rotary furnace calcination section zone-3 is 750-800 ℃, with a sucrose addition amount of 10-30 g/L. This study optimizes the calcination process conditions, which has certain significance for promoting the engineering of two-step cold crucible glass curing technology, and reducing the calcination temperature can save operating costs.