The invention provides a signaling code encoding method applied to a broadcast communication system and a corresponding decoding method. Used code words for signaling code encoding are LDPC code wordswhich have a code length of N and an information bit length of K and are of a raptor-like structure. Generally, when noise exceeds a threshold that the code words can be decoded, a signaling code ina system completely cannot normally work and the system can be in a non-working state, but according to the signaling code encoding method applied to the broadcast communication system and the corresponding decoding method which are provided by the invention, when the noise exceeds the threshold that the code words can be decoded, superposition decoding is started up, after superposition encodingis successful in decoding, constantly changeable bits are decoded according to inconstantly changeable bits, and finally, all the word codes can be successfully decoded. A case that the system cannotnormally work when receiving the first several frames of data can be caused, but after sufficient frames, the system can normally work, so that noise resistance performance of the system is greatly improved.