Abstract: A ship should move at an appropriate speed during anchoring. Too high ship speed may harm the anchoring equipment and, consequently, cause accidents. In contrast, with too low ship speed the anchor and the chain may foul. A mathematical model relating anchor chain tension and ship speed is established on the basis of the ship kinetic energy model. Four types of real ships, including small, medium, large and very large ones, are studied to find the kinetic energy consumed during the anchoring process, from anchor touching the seabed to brought up, and define the strength requirements for the anchor equipment. The ship speed limits are calculated according to windlass brake force and anchor holding force respectively. The calculated ship speeds are compared with the empirical values, and the applicability of the calculated values is discussed. The suitable speed during anchoring is recommended.