It opens with a dwarf and fat guy teased by monkeys. Their kung fu master takes on the female monkey as a student. After about one minute of training our monkey girl now speaks English (or Chinese) and has excellent martial arts skills. She goes off to explore the human world.
There is a school of comedy where monkeys are always funny. Personally I find monkeys not even interesting much less funny. If you are from the monkey school of comedy this movie is for you. I can respect that some people enjoy this sort of movie so I will hold back on my criticism.
I rate this movie as below average for a 1979 martial arts movie for other faults. First, the fighting is nothing special and less than I would expect for someone as good as Chan Sing. Second, in his first scenes Chan Sing is one heck of a nice guy. Then on becoming the emperor he goes from nice guy to evil after one page of script. One more detail - her tail. She never had a tail until having a tail was a problem.
