Internal inserts can effectively enhance heat transfer，and also have good anti-scaling and scale removing performance.In the present numerical study，the effects of structural parameters of the spiral rotor internal insert on heat transfer and flow resistance were investigated.The numerical results confirmed that the heat transfer is enhanced by 30% and the friction resistance is increased by 600%～700% as compared with those in plain tube respectively.The increase in the clearance between blade and tube wall，the increase in the helix pitch of rotor，and the decrease in the radius of rotating shaft can decrease the rotational speed and then decrease the heat transfer rate and friction factor.Appropriately increasing the helix pitch of rotor，reducing the clearance between blade and tube wall and reducing the radius of rotating shaft can lead to a better heat transfer performance.