JD-S3, JD-S4 Two step semi automatic bottle blowing machine is improved on bases of JD-88-A bottle blowing machine .It is the most advanced semi automatic bottle blowing machine in the word . The machine has a number of patent applications. JD-S4 two step semi automatic bottle blowing machine which has four cylinders. The capacity can reach 2100-2300B/H for 500ml bottle, after the mould closed then put the perform inside then blowing, and the blowed bottles will come out automatically. As soon as the bottles come out the mould closed again automatically, then it will be in manually put perform, the operator only need to put the perform, others process is automatic. It specialized in the production of blowing the plastic container (PET/PMMA/PS), it has small size, low energy consumption rate, high efficiency, low investment, easy to operation and maintain etc.