Abstract: Taking Ninghua County in Fujian province as an example, the research was based on the theory of principal component analysis of oil crops production impact assessment methods.Eleven indexes of principal components were studied and two main components were selected for analysis on the influence of the Ninghua oil crop yield.The results showed that the planting area, level of economic development and population were the main factors which constrained Ninghua County oil crops production.Corresponding countermeasures and suggestions were put forward on the basis of the above study.