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In 2000, a consumption of a sweet potato is increasing rapidly because of we recognize a diverse faculty of a sweet potato as well-being food. Recently, The important problem in a sweet potato industry is how to increase of brand-power in region, So how to produce of good quality a sweet potato sapling is very important subject in a sweet potato industry. The income rate of a nut sweet potato is 43.2% per 10a and the income rate of a pumpkin sweet potato is 1.7% per 10a. The reason of the income rate of a pumpkin sweet potato is lower than the income rate of a nut sweet potato is because of that a quantity of a pumpkin sweet potato is 59.6% of a quantity of a nut sweet potato, and the price of a pumpkin sweet potato is 76.8% of a price of a nut sweet potato. To increase a income rate of a sweet potato, First, To increase of supply of a vinyl plastic hothouse, Second, To increase of supply of a non-virus sapling, Third, To get a higher price of a sweet potato sapling, Forth, To disinfect a vinyl plastic hothouse by sunning to protect of a virus and a harmful insects.