A wireless charging system, wherein the wireless charging system comprises a wireless charging apparatus and a to-be-charged device; the wireless charging apparatus is configured to: obtain, in a charging period, channel information of a transmission channel and a waveform parameter used to indicate a waveform of an electromagnetic wave signal, wherein the transmission channel is a channel between the wireless charging apparatus and the to-be-charged device at a first frequency, and the channel information comprises signal attenuation and a transmission delay that are of an electromagnetic wave signal transmitted through the transmission channel; and generate a target electromagnetic wave signal based on the channel information and the waveform parameter, and send the target electromagnetic wave signal to the to-be-charged device through the transmission channel; and the to-be-charged device is configured to: receive, through the transmission channel, the target electromagnetic wave signal sent by the wireless charging apparatus; and convert the target electromagnetic wave signal into a direct current signal, and perform charging based on the direct current signal; characterized in that the waveform parameter is an exponential factor for an exponential operation performed on the signal attenuation in the channel information in a process of generating the target electromagnetic wave signal; wherein the target electromagnetic wave signal meets the following formula: w n = e j φ n ̅ A n β 2 P ∑ n = 1 N A n 2 β where n represents the first frequency, w n represents the target electromagnetic wave signal, φ n represents the transmission delay included in the channel information, A n represents the signal attenuation included in the channel information, P is total transmit power of the wireless charging apparatus, and β is the waveform parameter. obtain, in a charging period, channel information of a transmission channel and a waveform parameter used to indicate a waveform of an electromagnetic wave signal, wherein the transmission channel is a channel between the wireless charging apparatus and the to-be-charged device at a first frequency, and the channel information comprises signal attenuation and a transmission delay that are of an electromagnetic wave signal transmitted through the transmission channel; and generate a target electromagnetic wave signal based on the channel information and the waveform parameter, and send the target electromagnetic wave signal to the to-be-charged device through the transmission channel; and the to-be-charged device is configured to: receive, through the transmission channel, the target electromagnetic wave signal sent by the wireless charging apparatus; and convert the target electromagnetic wave signal into a direct current signal, and perform charging based on the direct current signal; characterized in that the waveform parameter is an exponential factor for an exponential operation performed on the signal attenuation in the channel information in a process of generating the target electromagnetic wave signal; wherein the target electromagnetic wave signal meets the following formula: w n = e j φ n ̅ A n β 2 P ∑ n = 1 N A n 2 β where n represents the first frequency, w n represents the target electromagnetic wave signal, φ n represents the transmission delay included in the channel information, A n represents the signal attenuation included in the channel information, P is total transmit power of the wireless charging apparatus, and β is the waveform parameter. receive, through the transmission channel, the target electromagnetic wave signal sent by the wireless charging apparatus; and convert the target electromagnetic wave signal into a direct current signal, and perform charging based on the direct current signal; characterized in that the waveform parameter is an exponential factor for an exponential operation performed on the signal attenuation in the channel information in a process of generating the target electromagnetic wave signal; wherein the target electromagnetic wave signal meets the following formula: w n = e j φ n ̅ A n β 2 P ∑ n = 1 N A n 2 β where n represents the first frequency, w n represents the target electromagnetic wave signal, φ n represents the transmission delay included in the channel information, A n represents the signal attenuation included in the channel information, P is total transmit power of the wireless charging apparatus, and β is the waveform parameter.