A transmission power configuration method for Demodulation Reference Signal, DMRS, comprising: configuring a ratio between transmission power of a DMRS at each layer in a DMRS Resource Element, RE, and transmission power of data at a corresponding layer in a data RE to be a constant value by configuring the total transmission power of the DMRS RE corresponding to the DMRS; wherein configuring the ratio to be a constant value comprising: setting different constant values for different total layer numbers used in downlink transmission; or setting a unique constant value for different total layer numbers used in the downlink transmission; wherein the step of setting the different constant values for different total layer numbers used in the downlink transmission further comprises: when a rank is 5 to 8, using Code division multiplexing and Frequency/Time division multiplexing among different DMRS ports, wherein Code Division Multiplexing is performed to the pilot sequence corresponding to port0, port1, port4 and port6, and Code Division Multiplexing is performed to the pilot sequence corresponding to port2, port3, port5 and port7; setting a first constant value when the total layer number used in the downlink transmission is less than or equal to 2; and setting a second constant value when the total layer number used in the downlink transmission is greater than or equal to 3; wherein the constant value is set to be equal to the second constant value when the total layer number used in the downlink transmission is greater than or equal to 5. configuring a ratio between transmission power of a DMRS at each layer in a DMRS Resource Element, RE, and transmission power of data at a corresponding layer in a data RE to be a constant value by configuring the total transmission power of the DMRS RE corresponding to the DMRS; wherein configuring the ratio to be a constant value comprising: setting different constant values for different total layer numbers used in downlink transmission; or setting a unique constant value for different total layer numbers used in the downlink transmission; wherein the step of setting the different constant values for different total layer numbers used in the downlink transmission further comprises: when a rank is 5 to 8, using Code division multiplexing and Frequency/Time division multiplexing among different DMRS ports, wherein Code Division Multiplexing is performed to the pilot sequence corresponding to port0, port1, port4 and port6, and Code Division Multiplexing is performed to the pilot sequence corresponding to port2, port3, port5 and port7; setting a first constant value when the total layer number used in the downlink transmission is less than or equal to 2; and setting a second constant value when the total layer number used in the downlink transmission is greater than or equal to 3; wherein the constant value is set to be equal to the second constant value when the total layer number used in the downlink transmission is greater than or equal to 5. when a rank is 5 to 8, using Code division multiplexing and Frequency/Time division multiplexing among different DMRS ports, wherein Code Division Multiplexing is performed to the pilot sequence corresponding to port0, port1, port4 and port6, and Code Division Multiplexing is performed to the pilot sequence corresponding to port2, port3, port5 and port7; setting a first constant value when the total layer number used in the downlink transmission is less than or equal to 2; and setting a second constant value when the total layer number used in the downlink transmission is greater than or equal to 3; wherein the constant value is set to be equal to the second constant value when the total layer number used in the downlink transmission is greater than or equal to 5.