Fear and greed are the psychological sources of account fluctuations. They do not need to be eliminated but can be recognized and adjusted. This article dissects the three fear patterns of fear of loss, fear of missing out, and fear of making mistakes, as well as three manifestations of greed such as position amplification, luck as a function of ability, and unwillingness to leave the market. It analyzes how the alternating cycle of the two causes the account to deviate from the plan. It also explains how to put stop loss and profit and position upper limit before opening a position, and use a simulated environment to practice emotional adjustment.