Irregular Shelterwood System (ISS), one of the types of silviculture system in forest management has been implemented in different CF of Nepal. But, It still lacks the research on different parameters promoting regeneration of Shorea robusta as a future crop yield in forest. We studied the origin of regeneration, crown cover, and soil as a promoting parameter for sustained yield management. Two-phase study was carried out using stratified systematic random sampling technique within the treated and untreated areas of the forest. The result indicated the significance difference in the regeneration status between treated and untreated areas. In this forest part, most of the regeneration originated from seedlings while some were from root coppice. Specifically, the treated area exhibited a density of 16,800 seedlings and 4,693 saplings per hectare, compared to 11,960 seedlings and 2,688 saplings per hectare in the untreated area. This demonstrates that the ISS effectively promotes the regeneration of Sal trees, enhancing forest health and biodiversity. The analysis revealed that the origin of regeneration was predominantly from seedlings, with a notable absence of significant differences in seedling regeneration across different treated years. However, sapling regeneration showed significant variation, indicating that management practices under the ISS positively influence sapling establishment. Soil quality assessments indicated that treated areas had higher organic matter and better nutrient profiles, which are critical for supporting healthy plant growth. Furthermore, the study highlighted that environmental factors such as crown cover and organic carbon levels significantly affect regeneration outcomes. While organic matter positively influenced regeneration, crown cover and organic carbon were found to have negative effects. These findings underscore the importance of managing environmental conditions to ensure successful regeneration of Shorea robusta. Overall, the research supports the ISS as a viable strategy for sustainable forest management and the resilience of critical forest resources in community forestry settings.