A distributed base station lightning protection system, comprising a radio remote unit, RRU, (10; 20; 30), a shielded cable (21; 31), and a power supply system; the RRU (10; 20; 30) comprising: a primary circuit (101; 2011; 3011) configured to receive a power supply (201; 301) from the power supply system through the inner conductors (211; 311) in the shielded cable (21; 31); a secondary circuit (102; 2012; 3012) coupled to the primary circuit (101; 2011; 3011), wherein the secondary circuit collaborates with the primary circuit (101; 2011; 3011) to convert the power supply (201; 301) received by the primary circuit (101; 2011; 3011) into a working power supply (201; 301); and a working circuit (12; 202; 302) coupled to the secondary circuit (102; 2012; 3012); wherein the secondary circuit (102; 2012; 3012) outputs the working power supply (201; 301) to power the working circuit (12; 202; 302), and characterised in that: a surge over-voltage withstand capability between the primary circuit (101; 2011; 3011) and an earth is not less than a lightning over-voltage, the shielded cable (21; 31) comprises inner conductors (211; 311) and a shield layer (212;312), both ends of the shielded cable (21; 31) are grounded, and a surge over-voltage withstand capability between each inner conductor (211; 311) in the shielded cable (21; 31) and the shield layer (212; 312) of the shielded cable (21;31) is set to a value that is not less than the lightning over-voltage. the RRU (10; 20; 30) comprising: a primary circuit (101; 2011; 3011) configured to receive a power supply (201; 301) from the power supply system through the inner conductors (211; 311) in the shielded cable (21; 31); a secondary circuit (102; 2012; 3012) coupled to the primary circuit (101; 2011; 3011), wherein the secondary circuit collaborates with the primary circuit (101; 2011; 3011) to convert the power supply (201; 301) received by the primary circuit (101; 2011; 3011) into a working power supply (201; 301); and a working circuit (12; 202; 302) coupled to the secondary circuit (102; 2012; 3012); a primary circuit (101; 2011; 3011) configured to receive a power supply (201; 301) from the power supply system through the inner conductors (211; 311) in the shielded cable (21; 31); a secondary circuit (102; 2012; 3012) coupled to the primary circuit (101; 2011; 3011), wherein the secondary circuit collaborates with the primary circuit (101; 2011; 3011) to convert the power supply (201; 301) received by the primary circuit (101; 2011; 3011) into a working power supply (201; 301); and a working circuit (12; 202; 302) coupled to the secondary circuit (102; 2012; 3012); wherein the secondary circuit (102; 2012; 3012) outputs the working power supply (201; 301) to power the working circuit (12; 202; 302), and characterised in that: a surge over-voltage withstand capability between the primary circuit (101; 2011; 3011) and an earth is not less than a lightning over-voltage, the shielded cable (21; 31) comprises inner conductors (211; 311) and a shield layer (212;312), both ends of the shielded cable (21; 31) are grounded, and a surge over-voltage withstand capability between each inner conductor (211; 311) in the shielded cable (21; 31) and the shield layer (212; 312) of the shielded cable (21;31) is set to a value that is not less than the lightning over-voltage. a surge over-voltage withstand capability between the primary circuit (101; 2011; 3011) and an earth is not less than a lightning over-voltage, the shielded cable (21; 31) comprises inner conductors (211; 311) and a shield layer (212;312), both ends of the shielded cable (21; 31) are grounded, and a surge over-voltage withstand capability between each inner conductor (211; 311) in the shielded cable (21; 31) and the shield layer (212; 312) of the shielded cable (21;31) is set to a value that is not less than the lightning over-voltage.