A comparative case study focusing on the influence of pension cost and liability from manipulating actuarial assumptions is thorough discussed in this research; investigate the financial implication of the pension plan evaluation. The result shows: 1) By way of manipulating actuarial assumptions, the pension plan evaluation differs and the implicit problem of the pension plan evaluation does exist. 2)In the reasonable range, “employee turnover rate” has more profound influence on net periodic pension cost and liability than” the difference of discount rate and salary adjustment rate”.