The IR analysis software lacks a unified open software architecture model currently, this resulted in a series of problems, software stability, data format interoperability and software scalability was poor. The article aimed at this situation, proposed a flexible and reusable IR system architecture design. In the software data structure, referenced the JCAMP-DX standard spectral data format, re-designed the software underlying data structure to meet the spectral data processing needs. In the system design, the system was divided into three separate layers: UI layer, spectral data processing logic layer and instrument control layer. The IR analysis systems adopted the modular design, which can be customized according to functional requirements. Spectral data processor use multi-core design, this makes it is easy to extend and update the chemometrics algorithms.