摘要: At the Large Hadron Collider at CERN proton bunches cross a rate of 40MHz. Compact Muon Solenoid experiment original collision is reduced by factor O (1000) using Level-1 hardware trigger. A subsequent O(1000) data reduction obtained software-implemented High Level Trigger (HLT) selection that executed on multi-processor farm. In this review we present in detail prototype CMS HLT physics algorithms, expected trigger rates and performance terms both efficiency timing.