I forgot to post a topic in forum first. I'm sorry about that.
In Mesh Design workbench, the mesh cut tool(Cuts a mesh with a picked polygon) and some others don't work on object which has placement value, they act like if the object is not translated.
The following example is for mesh cut tool, also I've found same error in Curvature plot tool and Split mesh tool.(I didn't test error for other tools)
1.Create a new document
2.Set to top view(2)
3.Go to Mesh Design WB
4.Meshes > Regular soild > Create a 10x10x10mm cube
5.Select the cube > placement (...) > type 10mm for x coordinate > OK
6.Select the cube, execute the mesh cut tool
7.select right-bottom part of the cube with triangle shape > inner
8.The cube does not being cut
9.Do step 6
10.Do step 7, but select it like if the cube was not translated
11.The cube being cut.
OS: Windows 7
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6706 (Git)
Build type: Release
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17