Abstract: Ozone (O₃) is the main air pollutant in Shandong Province in summer. As an important precursor of O₃ formation, accurate calculation of biogenic volatile organic compounds (BVOCs) emissions will play an important role in the prevention and control of air pollution. In this study, the BVOCs emission rate and related meteorological factors of 9 dominant trees in Shandong Province before and after precipitation were monitored. G95 light-temperature model-remote sensing leaf biomass correction method was used in combination with tree stock information. The total amount of BVOCs emissions in Shandong Province was calculated. The results showed that: (1) The total emission of BVOCs in Shandong Province in 2021 was 256,837.21 t, the main emissions were isoprene (25.75%) and oxygen containing VOCs (36.61%). Monoterpene (18.20%), sesquiterpene (5.83%) and other VOCs (13.61%) were relatively low. (2) Forests and farmland were the main sources of BVOCs emissions, accounting for 58.81% and 32.07%, respectively. (3) The four cities with the largest BVOCs emissions were Linyi (11.92%), Weifang (9.81%), Jinan (9.53%) and Yantai (9.09%). (4) The BVOCs emission rates of coniferous species Platycladus orientalis, Pinus densiflora, broad-leaved species (Fraxinus chinensis), Robinia pseudoacacia, poplar (Populus tomentosa), oak (Quercus Linn) and willow (Salix babylonica) decreased significantly after precipitation (20.71%-93.94%). The study shows that the BVOCs emissions in summer in Shandong Province are high, with obvious seasonal characteristics. Rainfall can reduce the vegetation BVOCs emissions to varying degrees. The concentration of O₃ precursors can be reduced by artificial rainfall or watering in the peak period of O₃ pollution in summer.