A method for encoding a channel using a low-density parity-check (LDPC) code is provided. The method includes demodulating signals sent by a transmitter; determining positions of parity bits for puncturing through estimating a predetermined sequence of parity bit collections for puncturing and information of the number of theparity bit collections; and using position decoding data of theparity bits for puncturing, wherein steps of determining positions of the parity bits for puncturing comprise: determining the number of theparity bits for puncturing; determining the number of theparity bit collections for puncturing based on the determined number of the parity bits for puncturing; and obtaining a predetermined sequence of theparity bit collections, wherein when code word length is 16200 and information length is 7200, sequence of the parity bitcollections for puncturing is determined as6,4,13,9,18,8,15,20,5,17,2,22,24,7,12,1,16,23,14,0,21,10,19,11,3.