Abstract Poisonous cassava plants have high adaptability to their agroecological conditions and contribute to the total income of farmer households. In the Bangka Belitung Islands Province, especially Nibung Village, poison cassava has developed as a farmer's household business. However, the position of poison cassava farmers in the agribusiness system still tends to be weak, especially in terms of market control and pricing. This condition encourages the formation of a partnership pattern between farmers and collectors or processing business actors. This study aims to analyze the partnership patterns applied in poisonous cassava farming and measure the contribution of income to the total household income of farmers. The research method used in this study is a survey. Meanwhile, the sample extraction method used in this study is a simple random method, which totals 33 samples. The data obtained from the field is presented in tabulation and continued with mathematical data processing and explained descriptively in the discussion, to answer the first goal. Then to answer the second goal, namely how much it contributes to the total household income of farmers using farming analysis and calculation of contribution to household income. The results of this study can be found that the pattern of farmer partnerships in poisonous cassava is using the general trade partnership pattern. Its contribution to family income is 25%.