Dynamic Changes in US Technical Company under Uncertain Market

Since the outbreak of COVID-19 epidemic, great changes have taken place in world's economic situation. The interest rate increase by Federal Reserve has become one most influential actions. Researchers found that Fed's hike not only an impact on American financial market but also world situation to a certain extent. Therefore, this paper collects share price US dollar and exchange between RMB since June, 2021, uses VAR model ARMA-GARCH analyze data, examine how will affect dollar's value Apple's price, predict future development trend case increase, so as further study dynamic technology companies uncertain market.