Fieldbus technology is a hotspot in the Process Control Industry all over the world． HART protocol，as the transitional Fieldbus protocol，preserves the 4-20 mA signal and enables two-way digital communications to occur without disturbing the integrity of the 4-20 mA signal．Now the primary domestic manufacturers have started producing HART smart devices．In order to exert the most capacities of these smart devices．the corresponding software is urgently required to support them．At the same time，to break the monopoly of the foreign corporations，and to promote the development of the national industry, the project--HART Protocol Based Fieldbus Control System-- was set up as the 9th 5-Year-Plan National Key Development Project．This thesis is just based on the research work the author participated in the key project． What the exact subject the author participated is the "HART Device Management System" ，HDMS for short．So the thesis is mainly to introduce the design and implement of HDMS．The dissertation is divided to five chapters，which include： 1．The conception of Fieldbus is discussed．The history of Fieldbus development and some of its current protocols are also introduced．By comparing the Fieldbus Control System with traditional DCS system，readers can draw a conclusion： Fieldbus Technology is the irresistible trend in the future Industrial Automation Field． 2．The HART protocol specifications．which include Physical Layer, Data Link Layer, Application Layer Specification and Device Describe Language，are briefly analyzed． 3．The demand analysis and overall design of HDMS are introduced． 4．Detailed explanation for design and implement of HDMS．The two most important key technologies，the method of dealing with HART special commands and the implement of OPC server interfaces，are stressed． 5．The sample application of HDMS in Shandong Province is introduced．At last，the summary of the dissertation is given，and besides，some existing problems in current system are listed． The early version of HDMS was exhibited in MICONEX 98'in May 1 998 and won high evaluation．Then in the later sample application，it was praised by the user． On April 18，2000，HDMS passed the final national approval．The next aim of HDMS is to be commercial software．
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