An intelligent MC measuring system for lumber was designed by the authors and presented in this article.The hardware circuit and software flow chart of this system are described in detail.A dynamic compensation method is applied to eliminate zero drift and temperature drift errors.A test showed that the mean errors of the measured results from this new system was less than 4% above fiber saturation point,and less than 2% below fiber saturation point,and even lower tian 1% around the final MC（14%～9%）.These results demonstrated the precision and reliability of the system to be effectively improved.