procedure bacaktrace(n)
k = 1;
while (k>0) do
if Tk (x1,x2,...,xk-1)的值還未取遍 Then
{xk = Tk(x1,x2,...xK-1)中未取遍的值；
if Bk (x1,x2,...,xk) then
{(x1,x2,...xk)被激活；
if k == n then 輸出（x1,x2,....xn）;
else k = k+1; //深度擴(kuò)展搜索
}
}
else k = k-1 //試探完了所有的x k ,回溯
end bacaktrace