Monitoring was carried for a slope protection project in highway to survey the soil and water conservation effects through bioengineering techniques for slope protection. The results indicated that through bioengineering techniques for slope protection such as herbs planting, the foliage can cover the whole high and steep slopes in the highway and get significant soil and water conservation effects. The development of soil erosion could he controlled and gully erosion were rarely happened on slope protected with bioengineering techniques. Moreover, the mean runoff index is lower than 15.97% and soil erosion mass is rather low on the protected slope under mediumheavy rain and hard rain. The slope protection mechanism of bioengineering techniques was analyzed. The soil and water conservation effects is closely in relation with vegetation interception, power reduction, controlling of slope runoff, root anchorage and reinforcement etc. , and also property of bioengineering techniques for slope protection.