The key to the automation of a kiln is how to determine the moisture contents (MCs) of sample boards inside a stack. This paper describes a new, microcomputerized wood dry kiln control system using special load cell’s for measureing the weights of sample boards inside the stack. The computer controls the dry bulb and wet bulb temperatures of a kiln based on the MCs calculated from the data of weights obtaind. Smooth schedules using MCs as the independent variables are recommended, however, if it is necessary, other kind of schedules can also be used. This system is easy to use, for there is English or Chinese prompt on the screen of CRT. There are four curves on the upper part of the CRT, they are the average MC of the sample boards, dry bulb and wet bulb temperatures, the depressions of dry bulb temperatures. On the lower part of the CRT, one can see the current values of time, MCs, temperatures, schedule, and the status of the valves and relays of the kiln. The data and curves mentioned above, as well as the current weights of sample boards can be logged with a dot-matrix printer.