SBAS systems for safety of life (SoL) applications enhance the accuracy but above all improve the integrity. The related research has applied for the civil aviation at present. The RTCA DO 229D provides the performance standards of the SBAS receiver. Civil aviation requiring stringent safety formulates the corresponding guidelines of the receiver according to the standards， but users for lower security requirements has not formed a corresponding receiver standards. Besides the SoL service, the EGNOS open service (OS) has been available since 2009. Since then most manufacturers have partially followed the standards for the design of their products, but some implementations may not be optimal in some cases. According to the key technology analysis based on EGNOS open service receivers, the objective of this paper is to produce set of clear guidelines for GNSS receiver manufacturers on how to properly make use of the EGNOS broadcast messages to improve their positioning accuracy measurements for open service. Meanwhile the receiver manufacturers of BDSBAS have certain reference significance.