This standard specifies the terms and definitions, requirements, test methods, inspection rules, marking, packaging, transportation and storage of rice nitrogen-fixing microbial inoculant products. This standard applies to microbial agents for nitrogen fixation in rice containing a specific strain of Pseudomonas stutzeri (Pseudomonasstutzeri) and fermentation metabolites. The main technical content of this standard includes bacterial strains, sensory requirements, technical requirements, harmlessness indicators, field tests, etc.