A method for improving transmission power of a pilot frequency in an imbalance area of uplink and downlink between a cell of a low-power base station and a macro cell, applied in the low-power base station, the method comprising: setting transmission power of a power-enhanced primary common pilot channel according to transmission power of a non power-enhanced primary common pilot channel and an increment; setting transmission power of a downlink service channel to be the same as transmission power of the downlink service channel without the power-enhancement, and setting the transmission power of the downlink service channel according to the transmission power of the non power-enhanced primary common pilot channel; and using the transmission power of the power-enhanced primary common pilot channel and the transmission power of the downlink service channel to respectively transmit data in the power-enhanced primary common pilot channel and the downlink service channel, characterized in that the setting the transmission power of the power-enhanced primary common pilot channel according to the transmission power of the non power-enhanced primary common pilot channel and the increment comprises: P p - cpich = P vitrual _ p _ cpich + Delta; wherein P p - cpich is the transmission power of the power-enhanced primary common pilot channel, P vitrual _ p _ cpich is the transmission power of the non power-enhanced primary common pilot channel, and Delta is the increment, and the method further comprising: obtaining Delta according to a size of the imbalance area of uplink and downlink between the cell of the low-power base station and the macro cell, a soft handover parameter, and an offset parameter of an independent cell in the cell of the low-power base station when the transmission power of the primary common pilot channel is not enhanced. setting transmission power of a power-enhanced primary common pilot channel according to transmission power of a non power-enhanced primary common pilot channel and an increment; setting transmission power of a downlink service channel to be the same as transmission power of the downlink service channel without the power-enhancement, and setting the transmission power of the downlink service channel according to the transmission power of the non power-enhanced primary common pilot channel; and using the transmission power of the power-enhanced primary common pilot channel and the transmission power of the downlink service channel to respectively transmit data in the power-enhanced primary common pilot channel and the downlink service channel, characterized in that the setting the transmission power of the power-enhanced primary common pilot channel according to the transmission power of the non power-enhanced primary common pilot channel and the increment comprises: P p - cpich = P vitrual _ p _ cpich + Delta; wherein P p - cpich is the transmission power of the power-enhanced primary common pilot channel, P vitrual _ p _ cpich is the transmission power of the non power-enhanced primary common pilot channel, and Delta is the increment, and the method further comprising: obtaining Delta according to a size of the imbalance area of uplink and downlink between the cell of the low-power base station and the macro cell, a soft handover parameter, and an offset parameter of an independent cell in the cell of the low-power base station when the transmission power of the primary common pilot channel is not enhanced. P p - cpich = P vitrual _ p _ cpich + Delta; wherein P p - cpich is the transmission power of the power-enhanced primary common pilot channel, P vitrual _ p _ cpich is the transmission power of the non power-enhanced primary common pilot channel, and Delta is the increment, and the method further comprising: obtaining Delta according to a size of the imbalance area of uplink and downlink between the cell of the low-power base station and the macro cell, a soft handover parameter, and an offset parameter of an independent cell in the cell of the low-power base station when the transmission power of the primary common pilot channel is not enhanced.