It　was　difficult　to　define　technological　contradictions　by　using　Technological　Theory　of　Inventive　Problem　Resolving　(TRIZ).　An　improved　Current　Reality　Tree　(CRT)　in　Theory　of　Constrains　(TOC)　was　put　forward　to　define　technological　contradictions.　By　introducing　conceptions　of　the　logic　Positive/Negative　correlation　into　logic　reasoning　and　recognizing　forms　of　technological　contradictions　in　CRT,　it　provided　technological　support　to　resolve　conflicts　using　TRIZ.　An　Adjacency-Parameter　Matrix　was　constructed　on　data　structures　of　improved　Current　Reality　Tree　and　Algorithm　for　Depth　First　Technical-Conflict　Searching　ADCS　was　proposed.　Visual　operations　of　ADCS　were　realized　using　MATLAB　GUI　module.　Above-mentioned　methods　and　procedures　were　used　in　the　Technical-Conflict　determination　and　solution　of　Ultraviolet　Cooking　Oil　Smoke　Purifier　with　satisfactory　results.　It　was　proved　that　the　improved　CRT　models　was　feasible　and　practical　for　product　innovative　design.