For analyzing the spatial variability and correlation of corn yield, the combined method of traditional statistical methods and geostatistics methods were compared. Firstly, the reasonable sampling number was sampled and its statistical characteristics were analyzed. The crop yield information was obtained by traditional statistical methods. Then, the spatial variability and correlation of crop yield at county-scale were studied by geostatistics methods. The regional spatial distribution map of crop yield was made by kringing interpolation methods. The results showed that the corn yield and its components had intermediate variability and the coefficient of variability was 10%～100% by traditional statistics. However, the spatial distribution of corn yield was found that it had relatively strong spatial correlation by geostatistics analysis. Further analysis showed that the spatial variability of corn yield was depended on its consistent factors rather than random factors and the spatial heterogeneity scales was about 3400 m.