this invention discloses a mold assembly and method for manufacturing a syringe container which is provided with a cannula and a syringe barrel . the mold assembly includes : a first set ; a second set movable to abut against the first set to define a mold cavity ; a core in the mold cavity ; a first clamping piece secured to the first set ; and a second clamping piece secured to the second set ; wherein the cannula is held by the clamping pieces . the method includes : placing one end of the cannula into a port of the core ; moving the sets such that the clamping pieces hold the cannula the moment the sets abut against each other ; injecting polymeric material into the mold cavity ; separate the sets ; and removing the syringe container out of the core .