Utilizing the tools such as CLIPS can reduce the time that it takes to develop expert systems. CLIPS is a development tool for expert system and has public inference engine and utilities. However, skilled programming is needed to run CLIPS on Windows 95, and proper interfaces for knowledge engineers or end-users who do not have good programming ability should be developed. Therefore, the user-friendly interfaces including htitle, hmenu, hyesno, htextdisplay, and hrun were developed and added to CLIPS. The intefaces were excuted in command-line mode of CLIPS on Windows 95. Also, htitle and hmenu can display graphic files for expert system users comprehension. An expert system was constructed using the interfaces and examples were displayed.