A synchronization signal sending method, comprising: obtaining, by a network device, a first signal after performing discrete Fourier transform, DFT, and orthogonal frequency division multiplexing, OFDM, modulation, or OFDM modulation on a ZC sequence whose root index is 1; obtaining, by the network device, a second signal after performing, DFT and OFDM modulation, or OFDM modulation on a conjugate sequence of the ZC sequence whose root index is 1; generating, by the network device, a synchronization signal, wherein the synchronization signal comprises the first signal and the second signal; and sending, by the network device, the synchronization signal to a terminal device; wherein the obtaining, by a network device, a first signal after performing DFT and OFDM modulation, or OFDM modulation on a ZC sequence whose root index is 1 comprises: generating the ZC sequence whose root index is 1; oversampling the generated ZC sequence to generate an oversampled ZC sequence with a length equal to a total length of the first signal including a plurality of OFDM symbols and corresponding cyclic prefixes, CPs; performing a puncturing operation on the oversampled ZC sequence at locations of the CPs, wherein the performing a puncturing operation on the oversampled ZC sequence comprises removing some sequence elements of the oversampled ZC sequence; performing the DFT and OFDM modulation, or the OFDM modulation on the punctured ZC sequence, and adding the CPs to obtain the first signal, wherein corresponding sequence elements of the oversampled ZC sequence at the CP locations are missing in the synchronization signal such that phase jumps at the CP locations are avoided. obtaining, by a network device, a first signal after performing discrete Fourier transform, DFT, and orthogonal frequency division multiplexing, OFDM, modulation, or OFDM modulation on a ZC sequence whose root index is 1; obtaining, by the network device, a second signal after performing, DFT and OFDM modulation, or OFDM modulation on a conjugate sequence of the ZC sequence whose root index is 1; generating, by the network device, a synchronization signal, wherein the synchronization signal comprises the first signal and the second signal; and sending, by the network device, the synchronization signal to a terminal device; wherein the obtaining, by a network device, a first signal after performing DFT and OFDM modulation, or OFDM modulation on a ZC sequence whose root index is 1 comprises: generating the ZC sequence whose root index is 1; oversampling the generated ZC sequence to generate an oversampled ZC sequence with a length equal to a total length of the first signal including a plurality of OFDM symbols and corresponding cyclic prefixes, CPs; performing a puncturing operation on the oversampled ZC sequence at locations of the CPs, wherein the performing a puncturing operation on the oversampled ZC sequence comprises removing some sequence elements of the oversampled ZC sequence; performing the DFT and OFDM modulation, or the OFDM modulation on the punctured ZC sequence, and adding the CPs to obtain the first signal, wherein corresponding sequence elements of the oversampled ZC sequence at the CP locations are missing in the synchronization signal such that phase jumps at the CP locations are avoided. generating the ZC sequence whose root index is 1; oversampling the generated ZC sequence to generate an oversampled ZC sequence with a length equal to a total length of the first signal including a plurality of OFDM symbols and corresponding cyclic prefixes, CPs; performing a puncturing operation on the oversampled ZC sequence at locations of the CPs, wherein the performing a puncturing operation on the oversampled ZC sequence comprises removing some sequence elements of the oversampled ZC sequence; performing the DFT and OFDM modulation, or the OFDM modulation on the punctured ZC sequence, and adding the CPs to obtain the first signal, wherein corresponding sequence elements of the oversampled ZC sequence at the CP locations are missing in the synchronization signal such that phase jumps at the CP locations are avoided.