The establishment of "protection net" for the social vulnerable group is the necessary choice for the construction of a harmonious society. For the purpose of meeting the urgency of constructing and improving a protection net for vulnerable groups among involuntary migration, the paper proposes to design and set up an overall protection net oriented to vulnerable groups among involuntary migration through an a-nalysis of the group's characteristics and allocation range. The net depends on the overall planning and cooperation of the government, society and individual.