Abstract: [Research objective] In order to clarify the occurrence scope of Tomato yellow leaf curl virus disease (TYLCVD) in Shaanxi Province, the incidence of different cropping stubble, and the effect of Bemisia tabaci on TYLCVD, providing theoretical basis for the prevention and control of virus disease. [Methods] The effect of Bemisia tabaci on the infection cycle of TYLCVD was studied by means of regular field census and artificial inoculation. [Results] The results showed that TYLCVD was generally common in tomato cultivation areas in Shaanxi. The most serious disease occurred in Weinan, Yan"an, Xi"an and Xianyang, with an average incidence of 52.3% and a disease index of 32.6. The disease did not occurred in Hanzhong. The summer stubble disease was the most serious, with an average incidence of 94.8%, an average disease index of 53.8, and an average yield reduction of 74.0%, autumn stubble and winter stubble were the second, and early spring stubble was the least harmful. The occurrence period of Bemisia tabaci coincided with the virus disease. The virus epidemic occurred in the field 20-25 days after the occurrence of Bemisia tabaci at low density, and in the field 10-15 days after the occurrence of high density. An individual tomato with a single veneniferous Bemisia tabaci could cause tomato infection virus. With the increase of the population density, the incidence and degree of disease increased in turn. After being infected with TYLCVD for 15 minutes, the Bemisia tabaci can transmit the virus and cause 23.9% non-toxic plant diseases. The susceptibility rate reached 95.6% after 720 minutes and the transmission efficiency was positively correlated with the time of poisoning. [Conclusion] In Shaanxi Province, TYLCVD is serious in Guanzhong area. The most serious disease is found in summer stubble, followed by autumn stubble and winter stubble. The density, toxicity and virulence efficacy of Bemisia tabaci are the key factors for transmission of TYLCVD. Effective cutting off the transmission of Bemisia tabaci and avoiding the occurrence peak of Bemisia tabaci are the scientific basis for formulating the control strategy of TYLCVD.