For any affine(or Hadamard) 3-$(v,k,\L)$ design, four 3-designs are constructed. Namely a 3-$(4\L+4,\L+1,\binom\L2)$ design, a 3-$(4\L+4,2\L+2,\binom{2\L+1}2)$ design, a 3-$(4\L+4,\L+1,\binom\L2)$ design and a 3-$(4\L+4,3\L+3,3\binom{3\L+2}2)$ design. Moreover necessary conditions for the existence of simple such designs, i.e., with no repeated blocks, are also given.