In the downhole operation of oil, gas and water wells, the ball is widely used for pipe pressure testing, sealing and multi-stage (layer) fracturing. In order to accurately calculate the time when the ball arrives at the design point (i. e., the waiting time), the new formula of the waiting time calculation is developed by analyzing the movement process and the forces of the ball. It is pointed out the key factors affecting the waiting time include the coefficient of resistance around the ball, the ball diameter and density, and fracturing fluid properties, which provides a basis for optimizing the construction design. At the same time, a new type of tubular pressure test body that can reduce the waiting time and backwashing time is proposed, laying the foundation for further construction optimization.