Trading model has been changing since the vast implementation of Information and Communication Technology in every sector. This model is known as e-Commerce. Unlikely, there is still limited company which specifically trades agriculture product. Agriculture e-Commerce is known as a platform to buy and sell some agriculture products. Agriculture e-commerce has important role to support economic development and market expansion for farmers in particular and people in rural areas in general. There is still limited access and provider which buy and sell agriculture product to farmer and its farmer representative. Therefore, this research develops specific agriculture e-commerce. There are two main modules for agriculture e-commerce, purchasing and buying module. On this article, we acknowledge to develop the first module, which is purchasing module. Purchasing module was developed using Dynamic System Development Method (DSDM). Development phase includes feasibility study, business study, functional model iteration, and design and build model iteration. At the end of the phase, testing is conducted. The result of this study is the prototype of agriculture e-Commerce product with predefined functions. Purchasing module of the system depicts the opportunity for farmer to buy the tools and materials. This system has two main functions: purchasing system management and reporting management. System testing also was conducted to test the system.