Under the supply chain competition environment, the buyer supplier relationship is a “two edge sword” and brings companies both advantages and disadvantages. Enterprises can use positive financing activities to cope with two side effects of buyer supplier relationship. From the perspective of the buyer, the paper theoretically analyzed and empirically studied the impact of supplier relationship on enterprises cash holding policy and relevant mechanism. It was found that, a close supplier relationship had a positive effect on the enterprises cash holding by stimulating enterprises relationship commitment motive rather than precautionary motive, especially in the weak market position corporations and non stated owned corporations.