Research on key techniques of cultivated-land protection database design yu Xiaoying hunanchangsha, China Email: yzq422@sina.com With the rapid development of economy, a large plantation is becoming decrease. In order to realize dynamic protection for plantation in the country, China carried out an project to design cultivated-land protection database which overlay all around the country. Because the project is highly difficult on the data precision and the great data in the limited time, We must repeat the work many times. What¡¯s more, original map and data quality are bad. In such cases, It is necessary to identify the database technique in the practice of the work. Generalization of map based on graphic basic unit ¡°meander¡± was discussed and the database technique was explored. The practice of the work is significant for the subsequence of plantation protection work.