A link decision-making method applied to a link decision-making system, wherein the link decision-making system comprises a first user equipment and a second user equipment that are in a Voice over Internet Protocol (VoIP) call status, a transit server, and a decision-making device, wherein the first user equipment is directly connected with the second user equipment through a first link comprising no node other than the first user equipment and the second user equipment, and the first user equipment is also connected with the second user equipment through a second link comprising the transit server existing between the first user equipment and the second user equipment, and the method comprises: receiving, by the decision-making device, audio service quality data reported by the first user equipment, the audio service quality data being determined by the second user equipment according to audio data sent by the first user equipment and being fed back to the first user equipment; determining, by the decision-making device according to the audio service quality data, a link quality score of a current sending link of the first user equipment, the current sending link being the first link or the second link; and making, by the decision-making device according to the link quality score of the current sending link, a decision about using the first link or the second link as a subsequent sending link of the first user equipment, wherein the method further comprises: in a case that the subsequent sending link is the same as the current sending link, and a duration for which the current sending link is used exceeds N decision-making periods, determining, by the decision-making device according to the following equation, a time interval to a next request for link decision-making, wherein N is an integer greater than 1, Period = Period 0 + N ∗ Δ, wherein Period 0 is an initial time interval, and Δ is a link stability coefficient; and sending, by the decision-making device, the time interval Period to the first user equipment. receiving, by the decision-making device, audio service quality data reported by the first user equipment, the audio service quality data being determined by the second user equipment according to audio data sent by the first user equipment and being fed back to the first user equipment; determining, by the decision-making device according to the audio service quality data, a link quality score of a current sending link of the first user equipment, the current sending link being the first link or the second link; and making, by the decision-making device according to the link quality score of the current sending link, a decision about using the first link or the second link as a subsequent sending link of the first user equipment, wherein the method further comprises: in a case that the subsequent sending link is the same as the current sending link, and a duration for which the current sending link is used exceeds N decision-making periods, determining, by the decision-making device according to the following equation, a time interval to a next request for link decision-making, wherein N is an integer greater than 1, Period = Period 0 + N ∗ Δ, wherein Period 0 is an initial time interval, and Δ is a link stability coefficient; and sending, by the decision-making device, the time interval Period to the first user equipment. in a case that the subsequent sending link is the same as the current sending link, and a duration for which the current sending link is used exceeds N decision-making periods, determining, by the decision-making device according to the following equation, a time interval to a next request for link decision-making, wherein N is an integer greater than 1, Period = Period 0 + N ∗ Δ, wherein Period 0 is an initial time interval, and Δ is a link stability coefficient; and sending, by the decision-making device, the time interval Period to the first user equipment.