**6. Conclusions**

From the collective information on salt-tolerant acid proteases, we conclude that proteases are important enzymes naturally purified from variety of halotolerant microorganisms. A few salt-tolerant acid proteases, i.e. proteases produced by *Bacillus subtilis* JM3, *Bacillus megaterium* KLP&98, and *Aspergillus oryzae* LK&101, have a remarkable production and possess excellent properties such as high specific activity, excellent temperature and pH stability and salt-tolerant ability, which enlighten their potential applications in sauce bean paste and soy sauce fermentation.

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