With　rapid　development　of　IT　industry,　wide　use　of　internet　in　all　walks　of　life,and　the　increasing　emergence　of　various　threat　models,　this　paper　proposes　an　important　factor　in　information　security-　trusted　programming　technology　after　a　comparison　with　traditional　software　quality　analysis.　Quality　attributes　and　credibility　attributes　(software　complexity,　software　availability,　software　reliability　and　so　on)　are　studied　with　a　focus　on　the　analysis,　calculation　and　measurement　of　code　credibility.　This　technology　expects　great　utility　value　to　software　quality　assurance　and　information　security.　©　2012　IEEE.