Abstract: For confirmation artificial precipitation potential zone before cloud seeding, the field of ice crystal growing and field of cold cloud seedability are analyzed using additional sounding data according to Bergeron' s process. Macro-criterion of cold cloud seeding and the coefficient of seeding potential are presented. There is deep field of ice-water change as precipitation beginning above -1℃ layer. It spread from west to east as synoptic system and it fell from high. Whether or not continued seeding is judged in precipitation period with seedability layer and quasi-saturation layer. The macro-criterion may be used conveniently in artificial precipitation operation.