Abstract: We introduce in this article a kind of log scanner which uses the Nanling-1 type log diameter scanner principle and is equiped with TP-801 single board computer (on slice) for control and data-processing. It is named Nanling-2 type log scanner. The scanner can measure the length, diameter and volume of a single log, and the accumulative tatal volume of logs, and count the number of logs automatically, continuously and contactlessly. All these parameters can be recorded by an automatic typewrite. The single board computer can also be used as a special calculator for the log’s volume. Once the values of length and diameter of a log are put in, it can automatically calculate the log’s volume according to the state criterion. And the result is typed out.The scanner measures accurately, the errors made in diameter measurement being within 0.5cm. It has a good repeatability and stability. It can measure the smaller end of the log from 5 to 65cm in diameter, the resolution being 0.5cm.