Studies were carried of with the questionnaire method in 45 ecological farms 2004-2008. The aim of this study was to assess various directions of agricultural activity with gross margin as the main criterion of economic assessment of a farm. Gross margin showed increasing trend when estimated both per ha of croplands and per person employed in a farm. Only the drought in 2008 collapsed this trend in farms of some voivodships. For example, mean gross margin in 2008 was 2985 zł/ha and 43688 zł/person permanently employed in a farm and ranged from 1846 zł/ha in warmińsko-mazurskie voivodship to 3500 zł/ha in pomorskie voivodship and from 16415 zł/person in małopolskie to 87318 zł/person in wielkopolskie voivodship. The general, basic and detailed agricultural types were distinguished from among studied farms acc. to EU classification. Classes of economic size of farms were also estimated based on the sum of standard gross margin of all activities in a farm. Among general types of farms, 40% were classified to type 4 (specializing in fattening animal breeding) and to VHth class of economic size (16.0 - 40.0 ESU i.e. medium-large). From among basic types, 40% were classified to type 41 (dairy cattle) also counted to medium-large economic size class. Most farms from detailed types were assigned to type 411 (dairy cows) of the medium-large class. Subsidies in the study years constituted 40% of gross margin, on average, and ranged in particular groups of farms from 33.6% to 58.3%.