It was carried out to examine the characteristic of soil properties and their spatial heterogeneity on the comprehensive observation field of Iinze farmland ecosystem network using methods of classical statistics and geostatistics. The results showed that the variance coefficients of soil organic C, total N, available N, available P, available K, pH and electrical conductivity were more than 20% except pH. The range of soil organic C and total N were 13.8 m and 12.6 m, which indicated the high degree of spatial variability. The kriged soil properties distribution maps showed the same result. Taken 10% as a relative error, collecting 124 soil samples only could reach the significance level of 95 %. As long-term observation field, sampling subarea and field uniformization could be taken on. A more precise sampling scheme could be made based on spatial distribution pattern of test soil properties.