A method and system for wireless communication are provided. The method for wireless communication comprises following steps. The master device encodes an information code sequence including a communication demand into a wake-up sequence and transmits the wake-up sequence to each slave device continuously within a preset time period. The slave device receives the wake-up sequence in the detecting period, decodes the wake-up sequence, judges the correlation between the at least two parts, determines whether to be waken-up according to a judging result and performs corresponding response according to the decoding information. When implementing the technical solution in this invention, the power consumption in the wireless communication is reduced, the encoding efficiency is enhanced and the communication process is simpler.