The distribution of low skin impedance points (LSIP) over the medial side of forearm was plotted with a computer system designed for the measurement of skin impedance.Twelve volunteers were under observation.The exploring electrode moved forward in a even velocity from the radial axis of forearm to its ulnar axis and crossed the Lung meridian

Pericardium meridian and Heart meridian in succession.Thus

the measurement covered the whole area of the medial side of forearm.The results showed that the most of 391 LSIPs located right on or within 5 mm bilaterally to the travelling courses of Three Ying Meridians of Hand.It could be found in the area between every two me- ridians only in a few cases.Just so

the courses of Three Ying Meridians of Hand were clearly displayed.Under the condition of this experiment

LSIP appeared randomly

but viewing the situation as a whole

the distribution of LSIPs was still following the meridian courses.The results further demonstrated that the distribution of LSIPs along meridian courses not caused by the errors in measurement

but really a biological phenomenon

which was objectively exi- sted.