Evaluation of the farmland shelterbelt ecosystem service is of vital importance due to its practical application in regional economical development and ecological environment protection.In this case, farmland service function value of He′nan Province from 2001to 2005was evaluated by applying methods including market price, opportunity cost, and shadow price.Results showed that the total ecological service function value of the farmland in 2001and 2005were 1.04×10¹⁰ and 1.46×10¹⁰ yuan, respectively. The ecological service function index values followed such a decreasing order:soil protection>crops yield increment>biodi-versity protection>CO₂fixation and O₂release>air purification. The increment of total ecological servic was 1.53×10⁹ yuan each year. The service of soil conservation increment value was the largest(9.94×10⁸ yuan), followed by soil protection(3.01×10⁸ yuan), crops yield increment(1.25×10⁸ yuan), biodiversity protection(7.00×10⁷ yuan), CO₂ fixation and O₂release(3.77×10⁷ yuan), and air purification(7.79×10⁵ yuan). Due to the fact that the ecological service function value of the shelterbelt is tremendous, it is sugges-ted that ecological service market compensation mechanisms and perfected ecological service function valuated should be established as early as possible, so as to extend the farmland from an ecological style to an ecologi-cal and economical style.