After growing for a period of time, water spinach was harvested every two weeks manually. Total income of water spinach floating bed was calculated, which is shown in Table 4. According to the market price of water spinach, which was ¥4.0 kg−1, we could earn ¥47,628 with total profitable income of ¥37,628 by deducing ¥10,000 of total expenditure. The results indicated that enormous economy benefit could be achieved by water spinach floating bed.