The "Interim Measures for Construction Quality Margin" gave the provisions on the terms of defect liability period. These provisions have serious negative effects on the construction contract management. This negative effect is manifested in two aspects: firstly, it is difficult for people to distinguish defects liability period, defects notification period in FIDIC contract, and the warranty period in the law. Second is to cause a heavier burden on the contractors. This paper analyzes both the negative impacts and causes.