Abstract: Form and position errors of saw-lumber have been paid little attention to in our country so far.Taking into account of the characteristics of the logs and equipment in our country, the author made a survey of the form and position errors in lumber sawed by various kinds of band saw machines and found that:1. The form and position errors of lumber are far more loss-making than its dimension errors;2. Among the position errors, those of straightness of the line is most seriouS;3. The factors affecting the form and position errors are various.Based on what are mentioned above, the author suggests some technical-measures which can be adopted to eliminate form and position errors in saw-lumber.