Three times the salary of national statutory holidays means that workers who work overtime on national statutory holidays should pay 300% extra salary as overtime pay in addition to the double salary. National statutory holidays refer to holidays stipulated by the state, including New Year's Day, Spring Festival, Tomb-Sweeping Day, Labor Day, Dragon Boat Festival, Mid-Autumn Festival and National Day.

Legal basis:

Labor law of the people's Republic of China

Article 44 Under any of the following circumstances, the employing unit shall pay wages higher than the wages of the workers during their normal working hours according to the following standards:

(1) If the laborer is arranged to work longer hours, he shall be paid no less than 150% of the salary;

(2) If workers are arranged to work on rest days but cannot be arranged for compensatory time off, they shall be paid a salary of not less than 200% of their wages;

(3) If workers are arranged to work on legal holidays, they shall be paid no less than 300% of their wages.