The study in economic and energy analysis of the rice mill integrated farm which composes of rice milling sector, pig raising sector, and fish raising sector by considering three scales of rice mill which are 25, 50 and 100 tonne of paddy per day respectively. The results of this study show that the large seale rice mill intergrated farm is the most efficient farm complex in both economic and energy aspects. In rice milling sector, annual profit per unit (Baht/tonne of paddy) in each scale is increased in 4.9 : 4.5 : 4.3 per cent per year from the year 1988 to 2008. In the pig raising sector, annual profit/unit (Bath/pig 100 kg of live weight) has increased in 3.12 : 3.00 : 2.96 per cent per year respectively. In the fish raising sector, the annual profit per unit of output of the farm (Bath/fish 1 kg) increases about 1.24 : 1.51 : 1.39 per cent per year respectively. The energy analysis of the rice mill integrated farm reveals that energy requirement per unit of each sectore for small scale:medium scale : large scale are 104.3 : 87.8 71.0 MJ/tonne of paddy in the rice milling sector

and 3,781: 3,060 : 2,999 MJ/pig (100 kg live weight) on the pig raising sector

and 17.26 : 17.24 : 17.22 MJ/fish in the fish raising sector. The study results show that the large scale fo the rice mill interrated farm is the most efficient farm complex. However, the detailed study should be carried out for different production area to suit specific conditions in eadh case.