Abstract: While a break accident occurs in the reactor, the spray system will spray dense droplet to depress temperature and pressure in the interior of the containment, the behavior of multi-droplet evaporation will be complicated by evaporation shielding effects. To investigate the phase change characteristics of dense droplets in motion, this article proposes a spray droplet evaporation model modified by Distributed Point Source Method (DPSM) based on the macroscopic characteristics of the "shielding effect" of droplet groups under different droplet numbers, droplet sizes, and other working conditions. Simultaneously, to investigate the intrinsic relationship between the multiple droplets evaporation characteristics under shielding effects and the droplet boundary layer, numerical simulations and experimental investigations were conducted on suspended double droplets in a linear arrangement with different droplet diameter, droplet spacing to diameter ratio (C), relative velocity and temperature difference working conditions. The research results indicate that: The shielding effect has a significant impact on droplet evaporation, with a minimum correction coefficient of 0.07. As the droplets becomes denser, the shielding effect tends to a stable value, and after correcting for the droplet group shielding effect, the spray calculation program can achieve better prediction. The same variation pattern of droplet evaporation rate was observed through experiments and numerical simulations, as the distance between two droplets increases, the mutual influence of evaporation between droplets decreases, and the evaporation rate of droplets increases. However, as the spacing increases, the evaporation rate gradually weakens under the influence of the spacing variation. The temperature boundary layer dimensionless thickness (δ*) progressively increasing in the direction of air flow. The average of δ* has a quadratic polynomial relationship with the diameter when the difference between the diameters of two droplets increases, the difference has a significant influence on Nusselt number. As the value of C increases, the average of δ* decreases in a quadratic trend, and the Nusselt number on downstream droplet surface increases but the difference decreases. In the sensitivity analysis of evaporation influencing factors, droplet diameter has the most significant impact.