The present study was conducted in Lashkergah district of Helmand Province, Afghanistan in 2020. Two hundred eighty (280) maize producing respondents, small, medium and large were selected from the study area. The main objectives of the research were to work out the cost and returns of maize, to find out the different marketing channels involved in the marketing of maize, to examine the marketable surplus and disposal pattern of maize and to find out the constraints in production and marketing of maize and suggest suitable measures to overcome them. To calculate the cost of cultivation, marketable surplus and disposable pattern of maize simple mean and average method was used. The major findings of this study revealed that, on an average cost of cultivation per hectare of maize was found Afs. 62661 and cost of production was maximum in large size farms (63359 Afs/ha.). The yield of maize was observed 4895, 4940 and 5034 metric tons per hectare in small, medium and large size farms respectively. On an average, the net return was obtained Afs. 58769 per hectare that means the producers are profitable. Two marketing channels were observed during study that are, (I) producer – wholesaler – retailer – consumer and (II) producer – retailer – consumer’’. On an average the marketable surplus was found about 4088 Kg/ha. The major constraints of the production were lack of soil testing facility (100 percent), unavailability of good quality of insecticides and pesticides (90 percent) and higher prices of inputs (85.71 percent), the major constraints observed in sampled farm for marketing of maize were lack of processing industries based on maize as well as lack of regulated and co-operative market (100 percent) and lack of storage facility (90 percent).