It is unclear when the beginning of the year was celebrated before the Qin Dynasty. Traditionally, the year was said to have begun with month 1 during the Xia Dynasty, month 12 during the Shang Dynasty, and month 11 during the Zhou Dynasty. However, records show that the Zhou Dynasty began its year with month 1. Intercalary months, used to keep the lunar calendar synchronized with the sun, were added after month 12 during both the Shang Dynasty (according to surviving oracle bones) and the Zhou Dynasty (according to Sima Qian)。 The first Emperor of China Qin Shi Huang changed the beginning of the year to month 10 in 221 BC, also changing the location of the intercalary month to after month 9. Whether the New Year was celebrated at the beginning of month 10, of month 1, or both is unknown. In 104 BC, Emperor Wu of the Han Dynasty established month 1 as the beginning of the year, where it remains.
The first day is for the welcoming of the deities of the heavens and earth. Many people, especially Buddhists, abstain from meat consumption on the first day because it is believed that this will ensure longevity for them. Some consider lighting fires and using knives to be bad luck on New Year's Day, so all food to be consumed is cooked the day before.
Most importantly, the first day of Chinese New Year is a time when families visit the oldest and most senior members of their extended family, usually their parents, grandparents or great-grandparents.
Some families may invite a lion dance troupe as a symbolic ritual to usher in the Lunar New Year as well as to evict bad spirits from the premises. People also give red packets containing cash to junior members of the family, mostly children.
While fireworks and firecrackers are traditionally very popular, some regions have banned them due to concerns over fire hazards, which have resulted in increased number of fires around New Years and challenged municipal fire departments' work capacity. For this reason, various city governments (e.g.， Hong Kong, and Beijing, for a number of years) issued bans over fireworks and firecrackers in certain premises of the city. As a substitute, large-scale fireworks have been launched by governments in cities like Hong Kong to offer citizens the experience.
On the days before the New Year celebration Chinese families give their home a thorough cleaning. There is a Cantonese saying "Wash away the dirts on nianyiba"（年廿八，洗邋遢）， but the practice is not usually restricted on nianyiba（年二八， the 28th day of month 12）。 It is believed the cleaning sweeps away the bad luck of the preceding year and makes their homes ready for good luck. Brooms and dust pans are put away on the first day so that luck cannot be swept away. Some people give their homes, doors and window-panes a new coat of red paint. Homes are often decorated with paper cutouts of Chinese auspicious phrases and couplets.