Abstract: Effect of different machine type on corn harvesting loss rate was analyzed.Mechanical harvesting loss of corn by different mechanical harvesting methods and kernel moisture content was preliminarily discussed.A mathematical function between moisture content and loss rate was established.Results showed that different machine types had significant effects on corn harvest losses.There was a significant relationship between kernel loss and ear loss.Harvesting rate of harvester type of ear was higher than that of kernel.Different moisture content of kernel had a significant effect on harvest losses.There was a linear relationship between moisture content and loss rate.When moisture content of kernel was less than 25%，the kernel loss rate was less than 3%.This research could provide data support for research and promotion of corn mechanical harvesting loss reduction technology.