This paper presents some methods of using VAX-11 RMS (record management service)to build the Input/Output macros of single-precisi0n floating point number and the macros of creating data file on disk which records the output from the user's assembly language program. The Outcome has come to use on the VAX-11/780 computers in SIME. It makes things easy for the students to study the VAX-11 assembly language.