Aiming at the problem that the large-aperture optical component exists difference in temperature between the top and the bottom surfaces in precision finishing, the temperature property of the polishing pad and the workpiece, taking the annular lapping system for example, have been investigated. Significant temperature difference between the top and the bottom surfaces of the optical component is measured even at low rotating speed polishing applying the 1.6 m annular polishing machine. Two effective methods are proposed, one is adjusting the technological parameters, the other is adiabatic polishing. The feasibility of the methods is confirmed by the temperature measurement experiments using control variable and adiabatic polishing. The proposed methods lay the foundation of precision finishing.