In this paper the basic principle, tem perature and w ood species adjustm ent theory, design principle of conductance w ood m oisture m eter is described. Determ ination error analysis show ed there w as no obvious difference betw een the m eters m ade in China and abroad. This paper also analyses the developm ent trend of high m oisture content determ ination, the m easure to im prove reliability and to develop intelligent on line determ ination technology.