Abstract: Abstract: Studies about the spatial variability of the soil cation exchange capacity (CEC) could provide the construction of ecological tea plantation and management of soil fertilizer in tea plantation with some theoretical basis. Geostatistics were used for the analysis of the spatial variability of soil CEC in tea plantation at mountain of Mengding in Sichuan province with two sampling scales. Results:(1)In the tea plantation at small scale, the soil CEC was consumingly spatially dependent, the rate of nugget to sill was18.84%, the range of spatially dependent was 1818m. Structural factors were the main factors which affected the spatial variability of the soil CEC. The soil CEC had a stronger anisotropic structure in the aspect of the slope, and a weaker one at the aclinic aspect of the slope. According to the Ordinary Kriging method the equivalence of the soil CEC was distributed along the aclinic aspect of the slope from northeast to southwest, and the soil CEC content was reduced as the elevation went down. (2) In the tea plantation at micro scale, the soil CEC was consumingly spatially dependent too, and the rate of nugget to sill was16.52%, the range of spatially dependent was 311m. Structural factors were the main factors which affected the spatial variability of the soil CEC.The anisotropic Structure was different with the small scale, It had a stronger anisotropic structure in the aspect which near the aspect of slope，and a weaker one near the aclinic aspect of the slope. The soil CEC distributed along the aclinic aspect of the slope and some distributed like spots. From top to down of the slope，the soil CEC increased firrst，then reduced, and finally increased.