Patent ID: 7828625

Claim:
A method of supplying a polishing liquid, comprising the steps to: (a) provide a wafer having a material layer thereon; (b) perform a polishing process to the material layer of the wafer by providing at least a polishing liquid and polishing for a first period T 1 , wherein the material layer is in contact with a polishing pad on a platen during polishing; (c) stop supplying the polishing liquid and keep polishing for a second period T 2 ; (d) provide the polishing liquid and keep polishing for a third period T 3 ; and (e) repeat the steps of (c) to (d) until reaching an polishing endpoint of the polishing process, wherein a duration of the polishing process is T 0 , T 0 =T 1 +n×(T 2 +T 3 ), and n represents a total number of repeating the steps of (c) to (d), n is an integer larger than 0, T 1 is larger than T 2 and T 3 , and T 1 is at least larger than 10% of T 0 .