This paper address the question whether farmers who are participated in contract farming are more productivity and efficient in growing contract crop than the non-contract farmers. In this regard, 600 households from three villages have been surveyed from the state of Bihar in India. Cob-Douglas production function has been used in log-linear form to measure the farm productivity. The result suggested that contract farmers are able to achieve average high yield compared to non-contract one. Land and cost of seed are the major factors which helped contract farmers to attain higher level of productivity in growing the contract crop.