The objective of this article was to deliberate the relationship between trace elements and "Qi and blood" theory of traditional Chinese medicine by studying the similarities and differences in the contents of trace elements in SiJunzi decoction and Siwu decoction. Experiments indicate that there were some similarities and differences in the contents of trace elements in SiJunzi decoction and Siwu decoction, and it is very similar to "Qi and blood" theory of traditional Chinese medicine. When the Chinese herbs were decocted, the trace elements of Chinese herbs do not get into medicated solution uniformly. Different elements enter into the medicated solution in different periods of time and batches. It point out that the theory of methods of decocting Chinese herbs has a certain basis. These experiments remain existing some questions and doubts,it is worth to do some further related experiments and to be researched furthe.