In recent years some Chinese fir (Cunninghamia lanceolatas) stands in the southern China have been found "yellowing", i.e., the trey become stunted with yellowish to needles and root rot, and even dry up at last. The preliminary investigation revealed that it isn't infectious disease but physiological hindrance caused by inhibiting factors of soil. Owing to the complexity of the inhibiting factors in soil, we have failed to find out any critical value of soil characters by simple comparison of them. Therefore, a discriminant analysis of soil characters was conducted for two sets of surveyed data.