It is said that the custom of Chinese New Year started in when people offered sacrifice to ancestors in the last month of the lunar calendar. At that time, people prepared the sacrifice by doing thorough cleaning, having bathe and so on. Later, people began to worship different deities as well on that day. It is the time that almost all the farm works were done and people have free time. The sacrificing time changed according to the farming schedule and was not fixed until the Han Dynasty (202BC-220AD). The customs of worshipping deities and ancestors remains even though the ceremonies are not as grand as before. It is also the time that spring is coming, so people held all kinds of ceremonies to welcome it.