In order to compare the environmental benefits of two emission reduction measures, i.e. using low-sulphur oil and shore power technology, this paper takes the ships arriving at Guangzhou port as an example, based on the ship data of entry and departure visa of Guangzhou port in 2015, and uses statistical analysis to determine the relationship between different ship types of diesel engines, ship berthing time and ship deadweight tonnage, and based on the use of low-sulphur oil and berthing using shore power air pollutants emission On the basis of emission factors and diesel engine load, the environmental benefits of the two emission reduction measures are calculated by the calculation model established by the dynamic method. The results show that:(1) in 2015, when ships berthing in Guangzhou port used low-sulphur oil with sulphur content of 0.5%, PM10, NOx, SOx and CO2 decreased by 231.6t, 165.5t, 2039.3t and 0t respectively, when using low-sulphur oil with sulphur content of 0.1%, PM_(10), NO_(X), SO_(x)and CO_(2)decreased by 244.1t, 517.1t, 2382.7t and 0t respectively. when ships berthing in Guangzhou port used shore power, PM, NO_(x), SO_(x)and CO_(2)decreased by 283.8t, 2975.6t, 2407.7t and - 3782.2t respectively. (2) compared with the use of low sulphur oil, the use of shore power by berthing ships has a significant advantage in NOx emission reduction. In terms of particulate matter, SO_(X)and CO_(2)emission reduction, there is no significant difference between the two measures.
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