Twenty four pyrazoline derivatives modified from Celecoxib were designed and synthesized as bi-inhibitor of COX-2 and B-Raf. They were evaluated for their COX-1/COX-2/B-Raf inhibitory and anti-proliferation activities. Compound A3 displayed the most potent activity against COX-2 and HeLa cell line (IC₅₀=0.008 μM; GI₅₀=19.86 μM) and showed superb COX-1/COX-2 selectivity (>500), being more potent and selective than positive control Celecoxib or 5-fluorouracil. Compounds A5 and B5 were introduced best B-Raf inhibitory activities (IC₅₀=0.15 μM and 0.12 μM, respectively). Compound A4 retained superb bioactivity against COX-2 and HeLa cell line (IC₅₀=0.015 μM; GI₅₀=23.82 μM) and displayed moderate B-Raf inhibitory activity (IC₅₀=3.84 μM). Docking simulation was conducted to give binding patterns. QSAR models were built using bioactivity data and optimized conformations to provide a future modification of COX-2/B-Raf inhibitors.