The　Very　Long　Instruction　Word　(VLIW)　architecture　is　widely　used　for　DSP.　In　the　hybrid　coding　process,　since　the　procedures　of　inverse　quantization　and　inverse　scan　are　frequently　called　and　the　methods　of　optimizing　the　loops　that　frequently　appears　in　programs　are　studied.　With　TM1300　as　an　example,　the　character　of　the　VLIW　architecture　is　introduced.　Optimizing　these　two　procedures　would　improve　the　speed　of　whole　decoding　process.　These　methods　are　applied　to　optimize　the　inverse　scan　and　inverse　quantization　in　the　MPEG4.　The　instruction　cycles　required　for　the　optimized　algorithm　is　about　60%　of　the　original　one.