Abstract: When analyzing the phase parameters of stress wave signals alone, the strain wave analysis process ignores the interference of resonance signals, resulting in low accuracy of low strain detection results for steep slope section piles. Therefore, an optimization method for low strain detection of steep slope section piles considering the interference of resonance signals is proposed. Based on the soil construction method of steep slope foundation piles, the stress wave signal is obtained. By solving the probability density function of the resonance signal and combining it with the maximum likelihood function to correct the interference of the resonance signal, the stress wave signal is optimized, the traveling wave process of the stress wave in the foundation pile is analyzed, and the low strain detection results are analyzed. The experimental results show that the load consistency of the pile detection results obtained after the application of the proposed method is high, indicating that the accuracy of the results is high and meets the practical needs of pile safety detection in steep slope sections.