A method for determining an echo, comprising: obtaining (S101) an echo estimation result by performing echo estimation on an original audio signal; obtaining (S102) an optimization processing result by performing optimization processing on the echo estimation result, wherein, the optimization processing comprises at least one of amplitude dimension optimization processing, phase dimension optimization processing, or time domain dimension optimization processing; and determining (S103) an echo of the original audio signal using the optimization processing result; characterized in that performing the optimization processing on the echo estimation result comprises: obtaining (S601) an echo extraction result by performing echo extraction on the original audio signal using the echo estimation result; performing (S602) signal processing on the echo extraction result to convert the echo extraction result to a time domain waveform; and obtaining (S603) a fourth adjustment value by inputting the time domain waveform into a pre-trained time domain optimization model; wherein the fourth adjustment value is configured to adjust the echo estimation result in a time domain dimension; wherein the time domain optimization model is obtained by training based on time domain waveforms which are determined according to a voice signal sample with an echo and a voice signal sample removing the echo, the voice signal sample removing the echo is a sample obtained by removing the echo from the voice signal sample with the echo. obtaining (S101) an echo estimation result by performing echo estimation on an original audio signal; obtaining (S102) an optimization processing result by performing optimization processing on the echo estimation result, wherein, the optimization processing comprises at least one of amplitude dimension optimization processing, phase dimension optimization processing, or time domain dimension optimization processing; and determining (S103) an echo of the original audio signal using the optimization processing result; characterized in that performing the optimization processing on the echo estimation result comprises: obtaining (S601) an echo extraction result by performing echo extraction on the original audio signal using the echo estimation result; performing (S602) signal processing on the echo extraction result to convert the echo extraction result to a time domain waveform; and obtaining (S603) a fourth adjustment value by inputting the time domain waveform into a pre-trained time domain optimization model; wherein the fourth adjustment value is configured to adjust the echo estimation result in a time domain dimension; wherein the time domain optimization model is obtained by training based on time domain waveforms which are determined according to a voice signal sample with an echo and a voice signal sample removing the echo, the voice signal sample removing the echo is a sample obtained by removing the echo from the voice signal sample with the echo. obtaining (S601) an echo extraction result by performing echo extraction on the original audio signal using the echo estimation result; performing (S602) signal processing on the echo extraction result to convert the echo extraction result to a time domain waveform; and obtaining (S603) a fourth adjustment value by inputting the time domain waveform into a pre-trained time domain optimization model; wherein the fourth adjustment value is configured to adjust the echo estimation result in a time domain dimension; wherein the time domain optimization model is obtained by training based on time domain waveforms which are determined according to a voice signal sample with an echo and a voice signal sample removing the echo, the voice signal sample removing the echo is a sample obtained by removing the echo from the voice signal sample with the echo. <EOS>