After the project of returning farmland to forest and grass was implemented, the forest and grass structure of Karst Mountain vegetation was improved obviously. It is of great significance to study the infiltration characteristics of carbonate laterite in Karst Mountain in vegetation restoration for the restoration and reconstruction of karst ecosystem. The water infiltration characteristics of different negative pressure heads (-0.5, -3, -6, and -15 cm) under different vegetation covers (wild grass ground, shrub-grassland, and arbor land) were measured by disc infiltration method. The contribution rate of the hydraulic conductivity, the distribution constant of soil pore size, and the grade of pore under different negative pressures to water flow was calculated. The infiltration characteristics of carbonate laterite with different vegetation covers were clarified. The results showed that a significant differences in soil steady infiltration rate among wild grass ground, shrub-grassland, and arbor land under different water head conditions. The difference of soil steady infiltration rate increased with the increase of negative head, and the time required for soil infiltration in the test area to reach the stable infiltration state was long (about 120 min). The soil steady infiltration rate of wild grass ground was the highest (0.17 mm/min) under the condition of low head, but the arbor land was the largest (9.17 mm/min) under the high water head. There was significant difference in soil saturated hydraulic conductivity K_s among wild grass ground, shrub-grassland, and arbor land (P<0.01), and the saturated hydraulic conductivity of arbor land reached the maximum (4.62 mm/min). However, there was no significant difference in K₃, K₆, K₁₅, and Gardner α, and the saturated hydraulic conductivity K_s of carbonate laterite was only controlled by soil organic matter content and soil conductivity. The quantity and the proportion of macropores in the soil of the arbor land were significantly larger than that of the shrub-grassland and the wild grass ground (P<0.05), and the water conductivity of carbonate laterite was mainly controlled by the effect of soil macropores on water flow (>70%). These results can provide data support and practical experience for ecological restoration and water resources carrying capacity analysis of Karst Mountain in Southwest China.