Abstract: In order to measure stand volume with angle gauge，according to the form point of standing tree，we propose and define a new concept-stand trunk，invent and make the three-dimensional an-gle gauge dendrometer．It is used directly tO measure the height of stand in the form point，obtain stand volme from deducing the stand trunk．The procedure is the method of stand form point．The method avoids visual difficulty in the forest that results from overlapping of the tree crown．Compare with the method of corresponding height sum，it is simple and convenient.easy to use．The simula-tion result with computer shows：applying the method to measure stand volume，the sampling preci-sion is about 95％ and systematic error is in the range of±5％．

Key words: Stand trunk, The method of form point, Three-dimensional angle gauge, Stand volume