DendroMesure(DM) is a aplication software to measure the treering width on computer window. Featuer of DM is measuring series intervals. DM always manage the image data in addition to numerical data. DM can read ".bmp" image data. Treering width data are adjusted by DPI. Measauring operation is only move mouse and click left button on the border of treering. Edit operation is click right button at the error measuring number. Measuring window is saparated from operation window in order to improve the operasion simplicity. Mmeasured treering data will be saved to ".csv" format data.