Abstract: The technical and economic evaluation of seabed mineral resources is an important part for exploitation of seabed mineral resources in China.Considering the present seabed mineral resources exploitation and utilization technology,in this paper a technical and economic evaluation model of seabed mineral resources exploitation is established based on discounted cash flow method.An example of the evaluation is given,the results show that the seabed mineral resources exploitation project has the characteristics of large investment,high income and high rate of return.Sensitivity analysis shows that the major impact factors on the economic benefit are as follows:annual mine output,ore grade and ore price.