There are two sets of agricultural mechanization systems in Egypt. The conventional for land preparation, irrigation and threshing) and non-conventional (for seeding, combine harvesting and land levelling by laser equipment). The last set is the focus of this study. The study objective is to identify the direction and magnitude of the major social and economic factors that affect the farmers adoption of such machinery systems. The study used the data of two field sample surveys conducted in 1985 / 1986 and 1992 ' 1993 from same area (the same districts of Sharkia Governorates) and representing the same farm size pattern. They survey concerned the farm operations, input-output data, with special emphasis on farm mechanization systems. The targets field crops of the surveys are (Wheat and Rice). The application of the mechanization system on farms over time is the indicator of adoption decision by farmers. The study showed that the economic factors that are significantly affecting the farmers adoption of non-conventional mechanization systems include The farms size, availability of family labor on farm, farm holding type, the distance from the agricultural mechanization station, farm income, the grain variety, quantity of chemical fertilizers. The social factors that are significantly affecting the farmers adoption of non-conventional mechanization systems include the number of years of education of both the farmer and his wife. The study concluded that the progressive farms are the most likely types of farms that adopt the non-conventional agricultural mechanization system in Egypt. The progressive farms are identified as of large acreage size, small family size, and which applies now high yield variety and into rive level of chemical fertilizers. This type of farms acquires high farm income.