Disclosed are a method and apparatus for sending an information sequence. In the method, phase rotation is performed on a binary sequence, wherein binaries in the binary sequence are elements in a set {a, -a}, a being a non-zero complex constant, and the phase rotation comprises one of the following: performing π/2 or -π/2 phase rotation on odd index elements in the binary sequence, and keeping phases of even index elements in the binary sequence invariable or performing π phase rotation on the even index elements in the binary sequence; and performing π/2 or -π/2 phase rotation on the even index elements in the binary sequence, and keeping phases of the odd index elements in the binary sequence invariable or performing π phase rotation. The binary sequence subjected to the phase rotation is mapped to a corresponding resource of a symbol, and is sent in a DFT-S-OFDMA mode. Thus, the power amplification efficiency of a transmitter is improved, and the detection performances of a PD2DSS, an SD2DSS and a PD2DSCH are improved.