The invention discloses a method and system for detecting an SFBC transmission mode. The method comprises the following steps: equalizing received signals by using an MMSE algorithm, and obtaining symbol estimation values of two code words of an interfering cell and noises corresponding to the two code words; performing an inversion operation on the symbol estimation values to obtain inversion data corresponding to the symbol estimation values; and performing a difference square operation on the inversion data to obtain a difference square value, substituting the different square value into adistance judgment formula or a decision formula, and when the distance judgment formula or the decision formula is met, the signals are SFBC signals, and otherwise, the signals are RANK2 signals. Themethod and the system for detecting the SFBC transmission mode provided by the invention can effectively distinguish SFBC and RANK2 codebooks, and have very high practicability.