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In the traditional Selected Mapping（SLM）scheme,side information is required to be transmitted in the reduction of Peak-Average-Power Ratio（PAPR）of Space-Frequency Block Coding（SFBC）Multi-Input Multi-Output Orthogonal Frequency Division Multiplexing（MIMO-OFDM）system.In order to solve this problem,a modified semi-blind SLM algorithm without side information is proposed in this paper.In order to reduce the complexity and embed the side information,the symbol sequence of the two antennas are divided into odd part and even part.One part is multiplied by the phase factor to help receiver to detect the side information.The analysis and simulation results show that the proposed algorithm greatly reduces the complexity of the receiver and has good Bit Error Rate（BER）performance.