Abstract:A new 2×1 000 MW water-cooling power plant unit is taken as an example,and the spindle feed pump with drive scheme is formulated,using the payback period method.Comparative analysis of 1×100% capacity spindle driven feedwater pump scheme with conventional 2 x 50% small capacity machine driving scheme of feed water pump is made,and it is pointed out that although main driving pump project has an increase of 21,531,400 yuan in each at the beginning of the unit investment,the annual operating net income can be increased by 8,460,000 yuan,and if the loan interest rate is calculated according to 6%,it takes 2.9 years to recover the cost,and investment payback period is far less than 10 years.So the project is feasible.