Based on the previous HAPI-4 control system,a balloon-borne attitude pointing control system digitalization is implemented by using 16 bits 80C196 single-chip processor for the first time. Meanwhile, by means of Global Positioning System(GPS), high precision Positioning and absolute time calibration is fulfilled. Also,a small,high density tape recorder is used as the balloon-borne data flow storage,and out-sight telemetry and teleconmmand is implemented by using INMARSAT system.Thus,a new balloonborne high energy astronomical telescope control system is brought about.