While the impact of vegetation on global climate has been confirmed, the feedback mechanisms between vegetation and precipitation at local scales remain unknown. This study selects oasis as relatively independent geographical units and analyzes stable isotopes in precipitation, soil water, and xylem water across four different vegetation cover areas. Results show that in oasis areas, tree-covered regions have the highest recycled vapor ratio (<em>f</em><em><sub>re</sub></em>), averaging 53 %, and the lowest raindrop re-evaporation rate (<em>f</em><em><sub>re-ev</sub></em>) at 38 %. Cropland, grassland, and shrub-covered areas have lower <em>f</em><em><sub>re</sub></em> (39 %) and higher average <em>f</em><em><sub>re-ev</sub></em> (between 60–70 %). In comparison, desert areas show more extreme differences between these two vapor ratios, further indicating that vegetation transpiration can increase precipitation by inhibiting sub-cloud re-evaporation loss of raindrops. This provides new insights into the impact of local vegetation on precipitation changes. In future assessments of water resources in arid environments, the effects of vegetation transpiration, recycled vapor, and secondary evaporation of precipitation on local water resources cannot be ignored.