Risk management is not only about positions and stop losses, but also the time dimension that is easily overlooked. This article discusses the mismatch risks of capital duration and participation methods, the different risk control concerns corresponding to short-term and long-term positions, how batch opening of positions can disperse the pressure of single timing, as well as the inter-cyclical rhythm of mid-term participation when market conditions are clear and convergence operations in event-intensive periods, helping traders incorporate time into the complete framework of risk management and allocation.