By comparing with east and middle areas, currently, the trade deficit of China’s western areas’ online shopping is obvious, how western local governments balance the trade deficit of eeconomy in less developed west areas? Shipping cost is a crucial factor that influences people’s online purchasing behaviors. Free shipping option can increase customers’ online purchase decisions greatly and domestic online shopping data support this point. Based on this behavioral economic law, this paper put forward that the government of the western areas can nudge local ebusiness economic development by exact subsidy for free shipping effect.