The theory of control chart, the key part of Statistical Process Control(SPC), has been an important tool in quality management. The state of process can be analyzed and judged by using control chart that adopts mathematical and statistical methods. The Embedded Quality Management Device has been developed to meet the needs of field quality management through the integration the theory of control chart with the embedded system. The Embedded Quality Management Device is an integrated one by integrating data acquisition with statistical analysis. Data writing, data storage, data disposal and creation and display of control chart are the main functions and so it is necessary to be studied separately. The paper deeply studies and realizes the contents above, and resolves the questions about the Embedded Quality Management Device. The results above make preparations for on-line real-time quality management.