The purpose of this research is to determinedthe effectiveness ofhealthpromotion by audio visual about breast self examination (BSE) for increasing girlâs knowledge about BSE. The design of thisresearch is Quasy experimentdesigned by Pre-post test with control group weredivided intoexperiment groupandcontrol group. The research was conductedongirlâs inthe âSMAN 2 Pekanbaruâ. The total sample are 78peoplewhowere takenby using systematic random sampling techniquesby noticing tothe inclusion criteria. Measuring instruments that usedin both groupsarequestionnairesthat have beentested for validityandrealibility. Analysisis usedunivariateandbivariateanalyzesusing independentanddependentsample ttest. The results showed there was asignificantincreasing intherate ofchange in girlâs knowledge about BSE in experimental grouphas givenhealthpromotionaboutBSE with p(0.000) < α (0,05). It means thathealthpromotionaboutBSE is effectiveforimproving girlâs knowledge about BSE. The results of this research isrecommend to every health care have to giving health promotion about BSE by audio visual to increasing knowledge about BSE.   Key words : Audio visual, knowledge, health promotion, BSE
                        
                        
                        
                        
                            
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