This research aims to study the rural women's knowledge are garding decrease the losses in the major cereal crops. The data for this research were collected using a questionnaire with a personal interview of 120 respondents rural women residents at the village of Manshit Abbas, Sidi Salem district, which were randomly selected from the wives of the holders and the holders women that was randomly selected by a simplified random sample and represent about 5 % of the 2400 holders wives and holders women who planted of wheat, rice and maize crops during the past two years, during the months of March and April 2020. Statistical methods such as frequency, percentage, standard deviation, and weighted mean were used to explain and interpret the results. The most important findings were: 65% of the total respondents have been characterized between a moderate and low level of total knowledge by the recommendations in relation decrease losses in the major cereal crops, about 81%, 58% and 57% in relation to decrease losses before harvest, during the harvest, and post-harvest losses. The most important problems facing respondents in relation to decrease losses were: increases in production input prices, the spread of agricultural diseases and pests, increase in pesticide costs for sprinkling the warehouse, lack of rural women's knowledge with cereal crop production recommendations, a shortage human labor at harvest time, knowledge lack of proper storage methods, use of traditional methods in the harvest process, and knowledge lack of rural women with post-harvest treatments.