Cassava is widely developed in Lampung province, because of high adaptability, easily cultivated, smallest risk of failure, and high price. The objective of the study is to analyze on-farm competitive advantage of casava farming system compared to maize and soybean farming systems. The activities were conducted at Central Lampung District from April 2012 to February 2013. The primary data were obtained from 90 farmers as main respondents through structured survey with direct interviews using structural questionnair. Secondary data were obtained from the office of relevant agencies and Statistic of Lampung Province. Financial analysis and competitive advantage analysis were exercised to measure the competitive advantage of cassava with respect to other secondary crops. The results showed that cassava farming more profitable than maize and soybean on farm income of Rp.21.109.000/ha and R/C of 2,91 compared to maize on farm income Rp.15.935.000 and R/C of 2,01 and soybean farm income of Rp.5.187.800/ha and R/C of 1,48. Cassava farming system will be competitive compared to maize and soybean farming on the productivity at least 34.567 kg/ha and 20,788 kg/ha and cassava price at least IDR 654/kg and IDR 394/kg.