Quality: it needs human to select products for quality control, with a huge amount of work.(2) After sale: after sale service is no more convenient and fast than direct sale platform.(3) Profit: low unit price and limited profit margin. Grapefruit Street home page is dominated by seckill, which is not conducive to the later adjustment of platform positioning.(4) Repurchase rate: mainly low-priced daily necessities, with limited repurchase rate. And no more than snacks, although the price is low, but the customer price is high.(5) Relevancy: poor relevancy of e-commerce category wastes big data of users owned by tool products.