Indonesia has large swamplands that could be developed into agricultural land for food crops. The physico-chemical characters of the soil in this agroecology, however, are generally unfavorable for the crop growth. Soybean yield of more than 2.0 t/ha might be achieved by implementing a suitable cultural practice. The objective of the current research was to evaluate the effectiveness, technical as well as financial feasibilities of improved soybean cultural practice (Kepas technology) on swampland. The research was conducted on swampland, in Jambi and South Kalimantan Provinces in 2018 on an area of 40 ha and 11 ha, respectively. The main components of the Kepas technology consisted of Anjasmoro improved variety, drainage canal on every 2.5 m or 3 m, soil amelioration using 750 kg/ha dolomite plus 1 t/ha organic fertilizer, and inorganic fertilization of 150 kg/ha Phonska and 100 kg/ha SP36. Results showed that practicing of such technology was effective to increase soybean grain yield on swampland, achieving an average of 2.3 t/ha in Jambi and 1.9 t/ha in South Kalimantan. The Kepas technology was technically and financially considered feasible, with the R/C ratio of 2.02 and 1.46, and the B/C ratio of 1.02 and 0.46 in Jambi and South Kalimantan, respectively. Break even points (BEP) of applying Kepas technology was Rp 4,445 per kg of grain at a yield of 1.14 t/ha and Rp 5,818 per kg of grain at a yield of 1.30 t/ha in Jambi and South Kalimantan, respectively.