A reactor was designed to produce and rise the productivity of biogas during anaerobic treatment of cattle dung. It had a size of 32 cubic meters, constructed and installed. The material used was a sheet of metal, the unit was put over the land. The results indicated that the biogas production rate was 0.63 m3/m3, while the daily average biogas production was 18.81 m3. The results also revealed that the average percentage of methane content in biogas was 66.3%. The average colorific value of produced gas was 451440 KJ/day. The results also showed that, The digested sludge can be used as a good fertilizer.