The evaluation and validation of an embedded peak recognition algorithm design for chromatography data analysis are presented. This portable gas chromatographic (GC) system can easily generate the measurement results directly without computer (PC) connecting in the field. In this research project, we demonstrated the sequential mapping as the peak recognition method to distinguish each part of the chromatographic peak. The new recognition algorithm not only reduces the dependence on the slope threshold, but also improves the relativity and accuracy of the data analysis process. The practice showed that the embedded analysis system can detect all the components even in the complex cases. Its output result was proven to be comparable to the Chemstation software data processing result. This portable GC design meets the analysis demand in the field and improves the convenience for its quick time response.