A parameter adjustment method, applicable to a communication device comprising a serializer/deserializer SerDes link, wherein the method comprises: monitoring, by the communication device, a packet loss rate of the SerDes link; if the packet loss rate is greater than a set threshold, acquiring, by the communication device, a current ambient temperature of the communication device; and if it is determined, according to a preset correspondence between a temperature range and a parameter, that the current ambient temperature does not match a SerDes parameter of the communication device, adjusting the SerDes parameter of the communication device according to the correspondence, wherein the SerDes parameter of the communication device comprises a pre-emphasis coefficient and a pre-equalization coefficient, a transmit end of the SerDes link pre-processes a to-be-sent serial signal by using the pre-emphasis coefficient, and a receive end of the SerDes link performs compensation for a received serial signal by using the pre-equalization coefficient; wherein the correspondence between a temperature range and a parameter comprises: a first correspondence, a second correspondence, and a third correspondence, wherein the first correspondence comprises a high temperature range and a first SerDes parameter, the second correspondence comprises a normal temperature range and a second SerDes parameter, and the third correspondence comprises a low temperature range and a third SerDes parameter, wherein one buffer exists between the low temperature range and the normal temperature range, and another buffer exists between the normal temperature range and the high temperature range; wherein the adjusting the SerDes parameter of the communication device according to the correspondence comprises: if the current ambient temperature falls within the high temperature range, adjusting the SerDes parameter of the communication device to be the first SerDes parameter, the first SerDes parameter comprises a first pre-emphasis coefficient and a first pre-equalization coefficient; if the current ambient temperature falls within the normal temperature range, adjusting the SerDes parameter of the communication device to be the second SerDes parameter the second SerDes parameter comprises a second pre-emphasis coefficient and a second pre-equalization coefficient; if the current ambient temperature falls within the low temperature range, adjusting the SerDes parameter of the communication device to be the third SerDes parameter, the third SerDes parameter comprises a third pre-emphasis coefficient and a third pre-equalization coefficient. monitoring, by the communication device, a packet loss rate of the SerDes link; if the current ambient temperature falls within the high temperature range, adjusting the SerDes parameter of the communication device to be the first SerDes parameter, the first SerDes parameter comprises a first pre-emphasis coefficient and a first pre-equalization coefficient; if the current ambient temperature falls within the normal temperature range, adjusting the SerDes parameter of the communication device to be the second SerDes parameter the second SerDes parameter comprises a second pre-emphasis coefficient and a second pre-equalization coefficient; if the current ambient temperature falls within the low temperature range, adjusting the SerDes parameter of the communication device to be the third SerDes parameter, the third SerDes parameter comprises a third pre-emphasis coefficient and a third pre-equalization coefficient.