Precipitation　is　a　critical　factor　affecting　regional　water　cycles,　water　ecology,　and　socioeconomic　development.　Monthly　precipitation,　water　vapor　pressure,　and　temperature　datasets　from　613　meteorological　stations　across　China　were　used　to　analyze　the　spatiotemporal　evolution　of　urban　rain　island　effects　at　the　national　scale　during　periods　of　slow　(1960-1969)　and　accelerated　(2010-2019)　urbanization.　The　combined　effects　of　artificial　water　dissipation　and　heat　islands　on　urban　precipitation　were　a　key　focus　of　this　study.　The　results　showed　that　rain　island　effects　(0-31.6　mm/month)　were　primarily　distributed　along　the　southeast　coast　(dominated　by　the　heat　island　effect)　and　northwest　inland　region　(dominated　by　artificial　water　dissipation).　During　winter,　the　relative　contribution　of　artificial　water　dissipation　was　higher　in　urban　areas,　and　the　rain　island　effect　was　more　apparent　than　in　the　summer.　Comparisons　of　precipitation　prior　to　and　following　large-scale　urbanization　showed　that　precipitation　and　rain　island　intensity　along　the　southeast　coast　and　northwest　inland　region　increased　by　0-28　and　0-28.6　mm/month,　respectively.　These　findings　indicate　that　artificial　water　dissipation　is　an　important　water　vapor　source　for　urban　precipitation,　particularly　during　winter　months.