As the most technologically mature reactor type in the fourth-generation nuclear energy system, the economy of sodium cooled fast reactors is becoming a key factor affecting their promotion and development in large-scale. The safety classification of structures, systems and components (SSCs) considers the safety importance of various systems and equipment in the reactor, and specifies their design, seismic categories, and nuclear quality assurance levels according to their safety levels. The purpose of safety classification of SSCs is to balance the safety and economy of power plants. Conducting in-depth research on safety classification can help improve the economy of power plants. First, this article introduces the safety function design and safety classification practice of China Commercial Fast Reactor (CFR1000), and applies the SSG-30 safety classification method to carry out safety classification of key SSCs of the CFR1000. Then, the results are compared and analyzed with existing safety classification results, and the application properties of this method on the pool type SFRs are summarized. At last, the possibility of safety classification optimization on the CFR1000 is discussed. Results show that the safety level of certain SSCs can be reduced applying SSG-30 method. The optimization of results can provide reference for the safety classification of SSCs in future SFRs.