Abstract: For improving the efficiency of pattern file importation and enhancing the ability of transplantation,a SD card host controller design program was brought up.The program was applied to the read and written of weaving machine pattern file.LPC2214 is chosen as the main control chip,and communication is executed with SD card through SPI interface.The interface circuit and equipment drivers are designed and achieved,and part of the schematic of interface circuit is presented.An in-depth analysis of the structure of SD card driver is conducted and the principle and function of every driver level are expounded.The code of important function and explanation of their functions are given.The process of writing and reading of pattern file are described,and a file administration task is developed on the basis ofμC/OS-Ⅱreal-time operation system.