The solar flare is the mostly erupted activity. The magnetic field reconnection and the fast jet are the mysteries for the solar physics community. In this environment, it is wondering if there is the particles acceleration and how to work. In the present work, we chose a standard solar flare as an example to investigate the probable association with the termination shock scenario. We use a dynamic Monte Carlo method to examine the energy spectrum with the relevance to the flare event. In the termination shock scenario, the thermal energetic particles in the fast jet pushes into the top of the loop for shock formation and acceleration efficiently. As a result, we obtain the detailed energy spectra, structures with different behaviors at the related episodes of the termination shock evolution. Therefore, we predict that there is a impulsive termination shock and particles acceleration.