A = (aij) ∈ Rn×n is called anti-bisymmetric matrix if aij=-aij,aij =-an-j+1,,n-i+1,i ,j=1,2,… ,n. We denoted the set of all n × n anti-bisymmetric ma-trices by ABSRin×n. In this paper, we discuss the following two problems:Problem I: Given X,B∈Rn×n, find A∈ABSRn×n such that ‖ AX-B ‖=mix, where ‖‖ is the Frobenius norm.Problem I: Given X,B∈Rn×n, find A∈ABSRn×n such that ‖ A* -A ‖ =inf ‖ A* -A‖ , where SE is the solution set of Problem I .A∈SEFor problem I , the general form of SE has been given. For problem I , theexpression of the solution has been provided.