Beginning with an analysis on the esterification of soluble starch and phthalic anhydride, the authors inquire into the method of preparing monoester of phthalic acid and starch with a certain degree of substitution. 阐述由可溶性淀粉与邻苯二甲酸酐进行的酯化反应,探讨制备具有一定取代度的邻苯二甲酸淀粉单酯的方法。