Experiments were carried out to find the difference of resin canal numbers by tree age and topophysis of crown of black pine needles, and the results were summarized as follows. 1. The average numbers of resin canal by tree age were increased from the age of 5 years were not difference between 10 and thereafter years significantly. 2. In this observation, the range of resin canal number was 2 to 9. 3. The numbers by the topophysis of crown did not show significant differences but the individual trees showed significant variations in the canal number in younger trees.