Differential and integrated directed flow and elliptic flow of light charged particles (z≤2) are studied systematically for semi-central (b=5 fm)197 Au+197 Au collisions at incident energies from 25 to 250 MeV/nucleon by the isospin-dependent quantum molecular dynamics model. The changes of directed and elliptic flow with incident energy reflect the dynamic competition between the mean field and nucleon-nucleon collisions and also between collective rotation and expansion.