According to Western media, Professor Alan Lichtman uses 13 variables to predict the outcome of each U.S. election. This time, seven variables are in favor of Biden and six are in favor of trump. < p > < p > according to the Spanish “Le Monde” website reported on August 17, the economy is in recession, and the trump government’s response to the epidemic is disastrous. Against this background, with more than 70 days to go before the election, the public opinion survey shows that it has such a clear advantage: the support rate is 7-12 percentage points ahead of the Republican Party. Never in a long time have we been in such a favorable position in the general election. Professor Allen Lichtman used 13 variables to predict the outcome of each election. He is one of the few experts to correctly predict the outcome of all U.S. elections since 1984. Lichtman previously wrote in the New York Times that there are seven variables in favor of Biden and six in favor of trump. < p > < p > he became a Republican candidate without competition (Biden has 27 competitors in the party); he is the current president; there is no third candidate to divert his votes; he has the ability to show his supporters the changes he has brought; there is no military or foreign policy disaster in his first term; the opponent lacks personal charm. < / P > < p > made progress in the 2018 mid-term elections; the economic collapse since April; long-term expectations shrouded in the shadow; protests and social tensions; Trump’s scandals and lies; the current president’s lack of outstanding achievements in foreign policy and security.