Abstract: Based on the analysis of characteristics of three separated systems of feed additive，precompound system and feed compound system, a concentrated shaped microcomputer control system with STD total bus was used to control feed compound system. The multitask and seperateconcentrated software diagram was used in the control system. CPU will sychronously separateconcentrated work by interupting， timing and cycling, if the event is random or influences the system accuracy directly, or CPU will discrectly work by asynchronously inquiring and subprograme nexting. This article also put forword the hybrid timing control with software interuption INT48H and error selflearning of computer system, which improves the system accuracy, reduces equipment investment and modernizes production management.