The study deals with the agricultural activity in Oman during the period (3-6 AH / 9-12 AD) with its existing facilities such as aflaj, or the work system in the cultivation of palm trees or planting, and the exchange needed by all of this between production, services and marketing, in addition to crafts and skills. Associated with agricultural activity, and studying the activity of workers in some crafts and professions supporting agricultural activity, directly or indirectly, such as workers specialized in digging aflaj and wells, workers in the manufacture of agricultural tools, or construction specialists, and the main production unit in all of that. In order to achieve the objectives of the study, the researchers followed the historical method in tracing the primary material from its sources, then subjecting it to analysis. The inductive method was also used to treat jurisprudential texts from their sources and analyze them to reach historical conclusions, drawing a clear picture of the nature of agricultural activity and its impact on economic life during the era of the subject of the study. The study reached several conclusions, including: that the agricultural activity in Amman during the study period was an economic actor, pivotal in production, a fundamental pillar in achieving food security for the community, and important in providing their luxury needs. An important incubator for many of their handicrafts, crafts and industries, and for the stability it provided for them, in addition, it formed an important part of the identity of the people of Oman abroad.