Abstract: The sulfide content in water was measured by methylene blue spectrophotometry.Taking the adsorption temperature,the carbonization temperature,the adsorption time and the solid-liquid ratio as factors,four factors and four levels of orthogonal experimental scheme were designed to explore the best experimental conditions for preparing the walnut shell biochar.According to the experimental results,the sulfide removal rate of 100 mL environmental water was 80.07%when the adsorption temperature was 30℃,the carbonization temperature was 500℃,the adsorption time was 70 min and the solid-liquid ratio was 0.35 mg/ml.