In Duguan MnAg ore field, western Henan, consisting of several MnAg depos its, several cryptoexplosive breccia pipes have been found. Ther e are close relations between cryptoexplosive breccia bodies and deposits. Th e g e ological feature and orecontrolling processes of two cryptoexplosive breccia p ipes have been stated in this paper and the genetic mechanism of cryptoexplosi v e breccia pipes has been summarized systematically.