The aim of this article was an attempt of the assessment of the investment processes in farms according to the economic size in Poland, after the integration with the European Union. The data from FADN database was used for years 2004-2011. The means of production factors in disposition of farms were described, and the capacity for reproduction and for renovate of assets were established. The influence of the net farm income on the realised investments was shown. It was found that the bigger a farm is the easier it invests, renovates the assets, basing mainly on its own income. However in small farms, the income is spent on casual needs, and not on investment in farm assets.