It is a linear programming method based on Cobb-Douglas production function to SPF. After getting the estimated value undetermined coefficient, we can try to get the project output, and then we can get the technical efficiency of every input unit. The SPF method was applied to analyze the fishing capacity in Zhejiang in 1996 -2004. The result showed that the technical efficiency in 2000 is the maximum, approximately 99.9%. After being compared with DEA method, we got the conclusion that both methods can indicate the level of capacity clearly. And the technical inefficient cost should be eliminated when analyzing fishing capacity by SPF method. In addition, with SPF method to calculate fishing capacity, all the input factors should be capitalized excepting labor, in order to improve the accuracy of calculating.