diff --git a/src/ui/main.fl b/src/ui/main.fl
new file mode 100644
index 0000000..6f99c7e
--- /dev/null
+++ b/src/ui/main.fl
@@ -0,0 +1,62 @@
+# data file for the Fltk User Interface Designer (fluid)
+version 1.0400
+header_name {.h}
+code_name {.cxx}
+class UserInterface {} {
+  Function {make_window()} {} {
+    Fl_Window main_window {
+      label WriteTool_RS open
+      xywh {721 399 693 467} type Double visible
+    } {
+      Fl_Output current_write_model {
+        label LastImeiAndSn
+        xywh {135 107 375 35}
+      }
+      Fl_Output excel_file_textbox {
+        label {CurrentExcelFile:}
+        xywh {135 20 375 35}
+      }
+      Fl_Button select_file_btn {
+        label SelectFile
+        xywh {535 20 90 30}
+      }
+      Fl_Output current_line_textbox {
+        label CurrentLine
+        xywh {135 62 375 35}
+      }
+      Fl_Button set_lines_btn {
+        label SetLines
+        xywh {535 60 90 30}
+      }
+      Fl_Button start_btn {
+        label Start
+        xywh {445 155 240 35} shortcut 0xff0d color 51 labeltype ENGRAVED_LABEL labelsize 18
+      }
+      Fl_Text_Display log_content {
+        xywh {10 210 670 250}
+      }
+      Fl_Input com_textbox {
+        label {COM:}
+        xywh {135 155 285 35}
+      }
+    }
+  }
+}
+
+class UserInterface1 {open selected
+} {
+  Function {make_set_line_window()} {} {
+    Fl_Window {} {open
+      xywh {828 554 228 43} type Double visible
+    } {
+      Fl_Input line_textbox {
+        label {Line:}
+        xywh {40 5 130 35}
+      }
+      Fl_Button ok_btn {
+        label ok
+        xywh {175 5 45 35}
+      }
+    }
+  }
+}