Comparative Analysis of Paddy Seed Breeding Income on Three Agro-Ecosystems in South Sumatera. Farmer's access to the quality and quantity of seed depends on the types available and how they are available.With high production capability, the superior varieties of rice take a role in transforming the agricultural system from subsistence into commercial, which are needed in various agro-ecosystems. The aims of this research are to analyzing the factors that influence member's income from seed breeding business, to analyzing income received by members in irrigation, rainfed and swamp agro-ecosystems of South Sumatra and also the seed processing units. This activity was conducted in April-November 2016. Sampling methode using Disproportinate stratified random sampling, consists of 15 farmers of Usaha Bersama farmer group in Tulus Ayu Village, OKU Timur Regency representing irrigation agro-ecosystem, 16 farmers of Widhatama seed processing unit in Lubuk Seberuk Village, OKI Regency representing rainfed agro-ecosystem and 15 farmers of Maju Bersama Agribusiness Group in Sako Village, Banyuasin Regency representing swamp agro-ecosystem. Data analysis using multiple linear regression and independent-sample T test. The result show that income of breeder of paddy member significantly influenced by productivity of seeds candidate and irrigation dummy agroecosystem. The income of group members from rice seed breeding was elastic to the changes of the productivity of seed candidates, and inelastic to changes of production costs, wetland area managed, number of family members involved in rice farming and dummy agro-ecosystem. The highest rice seed breeding income is obtained by members in rainfed agro-ecosystem (Rp 18,949,280/ha), while the highest income of seed processing unit is obtained in swamps agro-ecosystem (Rp 10,997,560/ha). rice seed, income, agroecosystem.