Paddy is one of the main crop in Raichur district of Karnataka. During harvesting season, shortage of labour demands a suitable machinery in this region.  Field evaluation trials of tractor operated combine harvester for harvesting of paddy crop were carried out as per RNAM and BIS test codes in farmers' fields. The studies were also conducted for comparing the cost of operation and saving in the cost over manual harvesting. The average value of effective field capacity of the machine was found to be from 0.64 to 0.81 ha/h with field efficiency of 67.02 to 76.83 per cent. The harvesting losses were in the range of 2.88 to 3.60 per cent for paddy harvesting. The cost of operation was lesser for tractor operated combine harvester as compared to manual method by 57.65 to 65.55 per cent. The performance evaluation trials indicated the suitability of machine for harvesting of paddy.