diff --git a/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/bin/grid_para.hypara b/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/bin/grid_para.hypara
index 2416a4e..c354b41 100644
--- a/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/bin/grid_para.hypara
+++ b/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/bin/grid_para.hypara
@@ -28,3 +28,14 @@ int from_gtype = 2;
 // out_gfile:  path of target file for grid convert to, *.fts type of file usually.
 string from_gfile = "./grid/cylinder_270w_split120.cgns";
 string out_gfile  = "./grid/cylinder_270w_split120.fts";
+
+// ----------------- Periodic Parameters --------------------------------
+// Notice:Periodic boundary only support translation or rotation along the X axis!
+// periodicType: Which symmetry plane is used in the mesh.
+//               0 -- without Periodic Boundary.
+//               1 -- Translational periodicity.
+//               2 -- Rotational periodicity.
+int periodicType = 1; 
+double translationLength[] = [0,3.14,0];
+double rotationAngle = 0;
+
diff --git a/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/三维结构层流圆柱LES算例说明文档.pdf b/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/三维结构层流圆柱LES算例说明文档.pdf
index bf41bf4..1d58a88 100644
Binary files a/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/三维结构层流圆柱LES算例说明文档.pdf and b/E01_ThreeD_Cylinder_LES_Re3900_Struct_120CPU/三维结构层流圆柱LES算例说明文档.pdf differ