Asia is the largest continent: The main causes of migration taking place from this continent include a huge change in the atmosphere and climate and the migration of ancient races of this continent has been continuing since the ancient time. During 18th century, a large number of population from China, India and Japan shifted to nearby countries due to pressure of increasing population.

Before 20th century, emigration of population from China started towards the countries situated in South-East Asia like Manchuria, Korea, Malaysia, Thailand, Indonesia, Vietnam, Philippines, Myanmar etc. During 1880-1900, a large number of Japanese made movement towards Hawaiian Islands, United states of America, Canada, Brazil, Australia, and Manchuria.

During ancient period, a large number of Indians emigrated to the neighbouring countries due to religious causes. For religious dissemination, a large number of Indians went to nearby countries like Sri Lanka, Indonesia, Tibet, Myanmar, etc. Even today, thousands of Indians are emigrating to other countries of the world due to employment.