In this paper we propose a fuzzy artificial Intelligent system with a learning function, which is called "FAIS" short for. This system has functions which acquire new fuzzy knowledge from experiences under an unknown situation and solve some problems by deducing anew state through fuzzy inference. The purpose of constructing this system "FAIS" is also to make a system that can solve many kinds of problems in various fields. As an example, the FAIS is applied to a pregnant prognosis for some cases of infertility, and then the usefulness of the FAIS is discussed from the simulation results.
