In this study, the Jinfulai tomato was used as the test material, the effects of exogenous calcium fertilizer on tomato plant growth, yield and umbilical rot were studied by spraying exogenous calcium chloride at different concentrations（CK, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%）. The results showed that the spraying exogenous calcium chloride can improve the photosynthetic rate and transpiration rate of tomatoes, so make the tomato plant height, stem diameter, maximum leaf length, maximum leaf width, leaf area, chlorophyll content, single fruit weight per plant, fruit numbers and yield were significantly increased. Additionally, it improved plot yield and per-mu yield while reducing the incidence of umbilical rot. Notably, tomatoes treated with 0.2% calcium chloride exhibited the highest morphological index, physiological index, and yield compared to other concentrations, with the lowest incidence of umbilical rot observed in this group.