population problem Based on the result of population projections, there will be a declined in the number of population in the next half century. The changing in the size of population can impact to the myriads of national problems. Nonetheless, the government should take the right step before the emergence of the problem. People who living in the industrial countries are more concern about how to improve their carier, because it is crucial in order to survive in such tight competition. They thinking that having family will only inhibiting their work performance. Thus, it will impact to the many problems. Firstly, the falling of natality which will caused unbalance on the age ratio In the long term. Secondly, these condition can have an affect on decreasing on labour force because of the inadequate of productive-age number. This hitch causes the reduction of taxable incomes. Finally, government must spent a huge amount of budget for medical centre and social services in order to support for elder people. However, there are possible solution to tackle these population problems. The first effective solution is support the new born. For example, japan facilitated the women who give birth by provides free birth-process as well as subsidies their child’s future education. The second resolution is, welcoming the productive migrants. This measure have been adopted to many advanced countries such as Australia, New Zealand and Canada and the immigrants had have been contributed to the growth of economy in these countries. In conclusion, it is immensely important for the government especially in the well-developed nations to take an action in terms of population size management In order to ensure their future economy.