The purpose of this study is to discuss the challenges of welfare in the era of the Fourth Industrial Revolution by identifying the major problems that have emerged during the development of social welfare. The welfare system has been shaped, developed and changed in order to help us cope with new dangers. The main task of social welfare in the future will be to find solutions to new social problems that have emerged in the post-industrial society and are likely to be deepened through the Fourth Industrial Revolution. The welfare system in Korea is faced with the overlapping tasks of solving all of the problems such as income security, absence of care, labor market polarization and employment instability. Innovations in social welfare services that are combined with advanced technologies are also a challenge. And the most important task for the welfare system is to keep the basic idea of welfare, and that is, to support the future intelligence information society so that it can develop into a people-centered society.

ABSTRACT
 INTRODUCTION
 THE DEVELOPMENT OF WELFARE SYSTEM IN WESTERN SOCIETY
  The Poor Relief Period
  The Formation Period of Modern Welfare System: From Late 19 Century to Early 20 Century
  The Welfare Expansion Period: From 1950s to 1960s
  The Period of Welfare Restructuring: After the Mid-1970s
 EMERGENCE OF THE POST INDUSTRIAL SOCIETY AND NEW SOCIAL RISKS
 THE ESTABLISHMENT OF SOCIAL WELFARE SYSTEM IN KOREA
 CHALLENGES OF THE FOURTH INDUSTRIAL REVOLUTION
  Polarization, Instability of Employment, and Social Investment
  Innovation of Service
 CONCLUSION
 REFERENCES

• So-young LEE(Department of Social Welfare, Seoul Digital University)