Abstract: The applications of feed-formula systems play a great role in reducing the feed cost and increasing the utilization efficiency of raw materials. The development of general feed-formula system based on Pocket Personal Computer (PC) was described in this article. Main function modules include formula calculation, formula review, data management, system maintenance and system updating. The efficiency of data operation and system stability were improved by using the developed middlewares for embedded database. The formula generation algorithm was optimized using two-step algorithm and direct inverse matrix computation. According to the number of the kinds of target materials, the actual computation time was 2-4 seconds. The time-effectiveness of data was guaranteed through the system updating methods based on memory card and network. Through the applications of this system in 31 feed farms of 4 counties in Beijing, it indicated that the Pocket PC based feed-formula system had those advantages: stable and practical, easy to use, easy to be accepted by middle and small feeding farmers. It has wide application prospect and popularization value.