A method for determining a spatial relation for uplink transmission, comprising: determining, by a terminal device, a spatial relation for uplink transmission of a first cell by using a first resource in a second cell; and performing, by a terminal device, uplink transmission in the first cell based on the spatial relation for uplink transmission of the first cell, characterized in that the determining a spatial relation for uplink transmission of a first cell by using a first resource in a second cell comprises one of the following: when the spatial relation for uplink transmission is not configured in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell; when the spatial relation for uplink transmission is not configured in the first cell, no CORESET is configured in the first cell, and no TCI-state that is used for transmission of the physical downlink shared channel, PDSCH is activated in a downlink bandwidth part currently activated in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell; and when the spatial relation for uplink transmission and a reference signal resource for road loss measurement are not configured in the first cell, no control-resource set is configured in the first cell, and no TCI-state that is used for transmission of the PDSCH is activated in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell. determining, by a terminal device, a spatial relation for uplink transmission of a first cell by using a first resource in a second cell; and performing, by a terminal device, uplink transmission in the first cell based on the spatial relation for uplink transmission of the first cell, characterized in that the determining a spatial relation for uplink transmission of a first cell by using a first resource in a second cell comprises one of the following: when the spatial relation for uplink transmission is not configured in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell; when the spatial relation for uplink transmission is not configured in the first cell, no CORESET is configured in the first cell, and no TCI-state that is used for transmission of the physical downlink shared channel, PDSCH is activated in a downlink bandwidth part currently activated in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell; and when the spatial relation for uplink transmission and a reference signal resource for road loss measurement are not configured in the first cell, no control-resource set is configured in the first cell, and no TCI-state that is used for transmission of the PDSCH is activated in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell. when the spatial relation for uplink transmission is not configured in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell; when the spatial relation for uplink transmission is not configured in the first cell, no CORESET is configured in the first cell, and no TCI-state that is used for transmission of the physical downlink shared channel, PDSCH is activated in a downlink bandwidth part currently activated in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell; and when the spatial relation for uplink transmission and a reference signal resource for road loss measurement are not configured in the first cell, no control-resource set is configured in the first cell, and no TCI-state that is used for transmission of the PDSCH is activated in the first cell, determining the spatial relation for uplink transmission of the first cell by using the first resource in the second cell.