The research aims to estimate the marketing efficiency of rain-fed cumin crop in Malikya area (Al-Hassaka governorate),this in order to reach the estimation of the total costs of marketing functions, medium and marginal costs, and estimate the economic volumes of marketed quantities of cumin. This study main problem lies in the search for high marketing costs of latency. Find carried out based on cross-sectional data, that were collected from a random sample of some cumin farmers and traders in Malikya area (88 farmers from 24 villages, and 12 trader cumin), And adopted in the implementation of research analysis method rebound with a single equation, to explain the relationship between marketed quantities of cumin as an independent variable, and the value of its marketing costs as the dependent variable. Results of the analysis showed that the value of the coefficient of determination (R Square) amounted to 0.841, and this means that the quantity of marketed cumin explain 84.1% of the changes in the marketing costs of cumin, The results of econometric analysis also showed the presence of deviations between marketed quantities of cumin, and the size of optimal marketed quantities due to higher overall marketing costs, medium costs, and marginal costs for the quantities marketed, means increased current cost of marketing for one kilogram of cumin, from those achieved for marketing efficient g by (2.1) SP / kg, furthermore, the application results of equations, measuring marketing efficiency (which relied on total production costs, the current cost of marketing the crop cumin, and the selling price per kilogram of it) showed that, the value of marketing efficiency amounted to about 88.29% and 50.53% depending on the indices marketing efficiency (equations 1 and 2 ) respectively , While the value of marketing efficiency (which relied on total production costs, and the optimum marking cost of the cumin, and the selling price per kilogram of it), about 90.54% and 52.73% depending on the indices marketing efficiency (equations 1 and 2), respectively, The research found a set of recommendations, such as establishing a marketing institution that oversees the operations of sale and marketing of medicinal and aromatic plants Group, and market surveillance in order to prevent monopoly, and improve the performance of marketing functions that traders provide when marketing of medicinal and aromatic products that, in order to reduce the costs of marketing, and delivery to consumers at the best prices.