Abstract: Considering the geometric similarity and relative change rate of sequences, this paper gives a way to improve the insufficiency on T’s correlation degree and calculate the absolute correlation degree and the relative correlation degree to obtain more accurate results. The calculated results and relevance analysis on Hainan province＇s R&D expenses by the improved T’s correlation degree show that Hainan province＇s R&D Planning has some drawbacks, such as funding imbalance and instability, slight and unreasonable planning, which would weaken the economic development by the investments of R&D. Some suggestions are given for reference at the end. 

Key words: T’s correlation degree, Grey algorithm, Investment in science and technology , Economic growth