The relationship between environmental factors (climate and soil) and plant life form gradient was analysed by doub sieving progressive regression method, and mathematical models were set up.

We concluded that plant life-form function groups were unsuitable as the key plant function types to evaluate and forecast the changes of region vegetation.

Variations in plant life-form spectra along an altitudinal gradient were investigated in Shikengkong, Guangdong province using gradient sampling method.