This essay,starting from the three groups of different but related statements,and taking the "convergent character" as the theoretical method,has an analysis of Lu Xun s "national character" which is considered as system of both opening-up and self-satisfied,thus providing a reasonable commentary with the unsettled points perplexing the researchers of Lu Xun for a long time.

We use F test method to define season cross-multiplication trend model s period and improve the method of defining initial value in the course of establishing the model.

This paper gives the optimized trend model for domestic college patent applied filled time seires which has well forecast effect in the near future.