Abstract: Biological fire-prevention-belt technique is specific to the relatively dense plantation of evergreen broad-leaf species in highly-flammable coniferous communities in the form of a belt, for the purpose of preventing and blocking the spread of surface and crown fire. Research indicates that the functions of fire prevention and blockage not solely come from poor flammability of the plant leaves, but more importantly are originated from the individual crown structure of evergreen broad-leaf species and the stands formed as a result of relatively dense plantation. By inhibiting the growth of surface fuels in the belt, the surface fire can be isolated. During the attack of a crown fire, the fire intensity is lessened by the poor combustibility and layered feature of the plant crown. This rapidly reduces the efficiency of heat transfer during the fire spread, leading to the automatic termination of fire spread. Compared to the conventional fuel breaks, this technique has obvious advantages in the efficiency of blocking flame radiation and firebrands sourced from an external fire and in conserving local soil and water as well as maintaining the local ecology. So far, there is a lack of the understanding on its quantitative capacity in resisting the crown fire intensity, and no technical performance indexes and detailed implementation specifications have been established; thus, this technique remains at an empirical stage. Further development and improvement of this technique not only can ensure its effectiveness in the forest fire separation practice, but also make it available to maximize its utilization in other fire-prone areas such as the wildland and urban interface.