Under rain conditions

the rain distribution on insulators is a key factor in inducing rain flash. In order to analyze rainfall deposition characteristics

we determined a criterion of raindrops adsorbed on insulator

and established a simulation model of wind tunnel.Furthermore

we analyzed the rainfall deposition characteristics of insulator

and researched a relationship of rainfall deposition and rainfall intensity and high-speed airflow. It is found that the rainfall deposition at windward is more serious than that at lateral side and lee side. Under a strong drag force

the rainfall deposition at lateral side is less. And due to turbulence

a small amount of raindrop moves to lee side and is adsorbed on it. With rainfall intensity increasing

rainfall deposition per unit time at windward first increases and then declines

but rainfall deposition per unit time at lateral and lee side gradually increases and becomes steady. With the inlet velocity increasing

rainfall deposition per unit time at windward and lateral side gradually increases and the increment rate slows down

rainfall deposition per unit time at lee side gradually reduces under 90° of inflow angle

and that gradually increases under less than 90° of inflow angle. With the inflow angle increasing

rainfall deposition per unit time at windward gradually increases

but rainfall deposition per unit time at lateral and lee side gradually reduces.