Designing social-security policy, particularly pension related polices, has played an indispensable role in designing social welfare polices aiming at achieving different social targets under each government’s national strategic plan as well as under each country’s speficic development circumstances. Currently, for a subtantial proportion of the retired working population in most less-developed and developing countries, mandatory pension benefits are their only source of income during their retirement lives. Meanwhile, a contrast fact has been witnessed in the cases of most developed countries, for example:in France and the United States of America (USA), mandatory pension income covers up to respectively, 20-25% and 58%, of the total income of retirees, whereas pension income from supplementary schemes shares 55-60% (France) and 30% (USA) of the total retirement income.In this regard, voluntary pension schemes in the form of superannuation fundsprovideworkers with larger opportunities to strengthen their retirement income and financial status. Besides, this type of pension plans could be also a way forward to most less-developed and developing countries in order to complete and stabilize their national pension systems. Hence, this paper will discuss supernannuation systems in some countries as well as their development orientation to draw attention to the important roles and the necessity of the superannuation fund system to each country’s development of social- welfare system.