Abstract: With continuous expansion of peanut planting area，self propelled peanut picking up harvester began to be widely used.Three kinds of self-propelled peanut picking up harvesters commonly used in Nanyang City were selected for field operation detection.Results showed that performance of this type of machine was improved，but impurity content of peanut in collecting box was still over standard.Reason for the problem was analyzed and some suggestions were put forward to optimize operation effect，such as strengthening manipulator training，harvesting in the right time，integration of agricultural machinery and agronomy，and improving quality of machines.