Abstract: The treatment of data for ~(40)Ar/~(39)Ar dating age is so complicated, that itis necessary to treat data with computer. The program of treatment of datafor ~(40)Ar/~(39)Ar dating age is edited with high grade expanding BASIC langua-ge, and is used on computer HP-9845(B). Using the program the computeroutput reports of experiment for ~(40)Ar/~(39)Ar dating age (ou irradiation para-meter J, apparent age in a temperature step, correction factor C_2, C_4 andC_3), output tabale of data for incremetal heating, age spectrogram, isochonegraph, and so on. Running results of the program show that it is reliableand satisfactory.