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Anisotropic flows (v1,v2,v3 and v4)of light fragments up to the mass number 4 as a function of rapidity are studied for 25 MeV/nucleon 40Ca+40Ca at large impact parameters by a quantum molecular dynamics model.A phenomenological scaling behaviour of rapidity dependent flow parameters vn(n=1,2,3 and4)is found as a function of mass number plus a constant term,which may arise from the interplay of collective and random motions.In addition,v4/v22 keeps to be almost independent of rapidity and remains a rough constant of 1/2 for all light fragments.