Abstract: According to Jia (1959) and Zhao et al. (1961), two stone artifacts were found from Layer 13 of the Sinanthropus site respectively in 1958 and 1960. Based upon his knowledge of the typological characteristics of the stone specimens, Zhang (1962) doubts they are fashioned by human agency.
The present author takes the polymorphism of artifacts in flaking and retouch, as well as stone specimens altered by natural agency, into" consideration. A discussion of the methodology of the stone artifacts is given.

Key words: stone artifacts; polymorphism; Sinanthropus site