This paper describes the procedure for the operation of a hybrid computer which was installed in our laboratory in March of this year and an example of the application of this computer to a simple optimal control problem. In order to shorten the time of program loading and to make the correction of the program easy, the program for the hybrid computation is written in the assembler language in which the result can be obtained if the original tape is loaded once in a computation. With the hybrid computer a simple optimal control problem resulted in a two-point boundary value problem is analyzed, It is much easier to obtain the solution automatically with the hybrid computer than to seek the solution manually with the analog computer.