Abstract: Engineering construction in mountainous areas disrupts the ecological balance of the surrounding environment, often triggering localized debris flow disasters.Debris flows induced by slope slag accumulation exhibit distinct characteristics of small scale and short-term suddenness, necessitating short-term protection measures for temporary facilities during construction.This study systematically analyzes the disaster-causing mechanisms of such debris flows, based on normal condition and congestion-breaking condition.The applicability of existing debris flow prevention measures for short-term protection is evaluated.Using available resources during construction and integrating the complementary advantages of various engineering methods, a comprehensive prevention and control system is designed based on phased treatment principles, which incorporates energy dissipation, slag retention, sediment deposition, overflow drainage, and foundation stabilization to achieve effective short-term protection with low construction and operational costs.The proposed framework provides practical insights for construction teams in similar scenarios.