The invention discloses a implementing device for enhancing downlink physical channel related to dedicated channel, for constructing processing channel of downlink physical channel, wherein the constructing process of the same includes processing on symbol level and on chip level. A E-RGCH/E-HICH symbol computing module is included, which is used for power weighting and summing in mentioned process on symbol level, and obtained symbol data is output of processing on chip level. The invention also discloses a implementing method for enhancing downlink physical channel related to dedicated channel. The inventive implementing device and method for enhancing downlink physical channel related to dedicated channel just need appropriate modification of conventional processing architecture of NodeB, and can support high speed uplink packets with big capacity to access HSUPA service.