The flankingstriking lightning protection is one of the important contents of lightning protection for highrise buildings (including super highrise building). Taking the classⅡ lightning protection building as an example, the paper analyzes the flankingstriking lightning current magnitude range and the probability distribution characteristics of highrise buildings by combining the electrogeometric model and lightning current featuresThe result shows that the higher the building, the greater the occurrence probability of flankingstriking lightning, and there is an exponential growth relationship between them; the higher the building, the bigger the flankingstriking lightning current magnitude rangeThe flankingstriking lightning protection technical problems in lightning protection project are discussed, which provides a reference for flankingstriking lightning protection for highrise buildings