Refcount 仅在您分配给接口变量时被修改，而不是分配给对象变量.

Refcount is only modified when you assign to an interface variable, not to an object variable.

procedure testMF(); 
var c1, c2 : TTestClass; 
    Intf1, Intf2 : IUnknown;
begin 
    c1 := TTestClass.Create(); // create, does NOT addref
    c2 := c1; // does NOT addref 

    Intf1 := C2;  //Here it does addref
    Intf2 := C1;  //Here, it does AddRef again

    c1 := nil; // Does NOT refcount - 1 
    Intf2 := nil; //Does refcount -1

    MessageBox( 0, pchar( inttostr( c2.refcount)), '', 0); // just to see the value 
    //Now it DOES show Refcount = 1
end;