In addition to the factors of capital operation, it is mainly pessimistic about the market outlook. According to the survey data, 20 19 was a year of steady progress in the corn market reform, the relationship between supply and demand in the corn market was further optimized, and the market formed a consistent "slow cow" expectation. However, African swine fever broke out halfway, the demand for corn feed was strongly impacted, and the expectation of bullish corn prices was also broken. Therefore, in the second half of 19, in addition to the operation of corn futures funds, the main factors are pessimism about the market outlook, the acceleration of pig slaughter and the obvious reduction of feed demand, which will further drive down corn prices, which will also drive down corn futures.