The following conclusions were obtained from comparison of L-function base on K-function、pair-correlation function and uniform angle index used in analyzing of tree spatial distribution pattern, the data from 5 actual plots and 30 simulative plots. Pair-correlation function and uniform angle index were exacter than L-function；Uniform angle index was effective and feasible than L-function and pair-correlation function, besides，uniform angle index has additional advantage for it can carry out qualitative and quantitative analysis synchronously by uniform angle index distributing diagram and average value W.