An inter-channel phase difference parameter encoding method, comprising: Obtaining a reference parameter used to determine an inter-channel phase difference, IPD, parameter encoding scheme of a current frame of a multi-channel signal; Determining the IPD parameter encoding scheme of the current frame based on the reference parameter, wherein the determined IPD parameter encoding scheme of the current frame is one of at least two preset IPD parameter encoding schemes; and Processing an IPD parameter of the current frame based on the determined IPD parameter encoding scheme of the current frame; wherein the reference parameter comprises at least one of a signal characteristic parameter of the current frame and signal characteristic parameters of A frames previous to the current frame, wherein A is an integer not less than 1; the signal characteristic parameter of the current frame comprises at least one of a parameter indicating correlation between left channel and right channel of the current frame, a variance of subband IPD parameters of the current frame, a signal type of the current frame, and the inter-channel time difference ITD parameter of the current frame; and the signal characteristic parameters of the A frames previous to the current frame comprise at least one of a parameter indicating correlation between left channel and right channel of each of the previous A frames, a variance of subband IPD parameters of each of the previous A frames, an ITD parameter of each of the previous A frames, an IPD parameter encoding scheme of each of the previous A frames, and a signal type of each of the previous A frames, wherein the signal type comprises a voice type or a music type; characterized in that the reference parameter comprises the parameter indicating the correlation between the left channel and right channel of the current frame; and if a value of the parameter indicating the correlation between the left channel and right channel of the current frame is greater than or equal to a first threshold, the IPD parameter encoding scheme of the current frame is a first encoding scheme in the at least two IPD parameter encoding schemes; wherein the reference parameter comprises the IPD parameter encoding scheme of each of the previous A frames and the signal type of each of the previous A frames; and if the IPD parameter encoding scheme of each of the previous A frames is the first encoding scheme in the at least two IPD parameter encoding schemes, and the signal type of each of the previous A frames is a music type, the IPD parameter encoding scheme of the current frame is the first encoding scheme. Obtaining a reference parameter used to determine an inter-channel phase difference, IPD, parameter encoding scheme of a current frame of a multi-channel signal; Determining the IPD parameter encoding scheme of the current frame based on the reference parameter, wherein the determined IPD parameter encoding scheme of the current frame is one of at least two preset IPD parameter encoding schemes; and Processing an IPD parameter of the current frame based on the determined IPD parameter encoding scheme of the current frame; wherein the reference parameter comprises at least one of a signal characteristic parameter of the current frame and signal characteristic parameters of A frames previous to the current frame, wherein A is an integer not less than 1; the signal characteristic parameter of the current frame comprises at least one of a parameter indicating correlation between left channel and right channel of the current frame, a variance of subband IPD parameters of the current frame, a signal type of the current frame, and the inter-channel time difference ITD parameter of the current frame; and the signal characteristic parameters of the A frames previous to the current frame comprise at least one of a parameter indicating correlation between left channel and right channel of each of the previous A frames, a variance of subband IPD parameters of each of the previous A frames, an ITD parameter of each of the previous A frames, an IPD parameter encoding scheme of each of the previous A frames, and a signal type of each of the previous A frames, wherein the signal type comprises a voice type or a music type; characterized in that the reference parameter comprises the parameter indicating the correlation between the left channel and right channel of the current frame; and if a value of the parameter indicating the correlation between the left channel and right channel of the current frame is greater than or equal to a first threshold, the IPD parameter encoding scheme of the current frame is a first encoding scheme in the at least two IPD parameter encoding schemes; wherein the reference parameter comprises the IPD parameter encoding scheme of each of the previous A frames and the signal type of each of the previous A frames; and if the IPD parameter encoding scheme of each of the previous A frames is the first encoding scheme in the at least two IPD parameter encoding schemes, and the signal type of each of the previous A frames is a music type, the IPD parameter encoding scheme of the current frame is the first encoding scheme.