Chloride ions adhering to concrete surface make salt attack. It is possible to remove the ions by high-pressure washing or wash-away by rain and to suppress salt attack. This study's objective is to clarify primary factors which influence effects of high-pressure washing or wash-away by rain. The parameters considered in this study are denseness of concrete surface, crack width and adhesive properties of chloride. It is, however, difficult to estimate quantitatively the amount of transfer of chloride by simulating real water flow and rain under many kinds of parameters. Therefore, this study proposes a simpler and quicker method than the previous method by using small specimens. The transfer resistance of chloride adhering to concrete surface to water flow is examined by this method. Results of this study are as follows. The higher denseness and wider crack width result in the more transfer of chloride. The amount of transfer of chloride adhering to concrete surface by salt water increases from 2 to 4 times greater than under by deliquescence. The transfer methods are divided into "physical transfer by colliding water（without melting）" and "outflow and penetration after melting". Most of transfer of chloride has finished in 2 minutes from start and the factor is "physical transfer by colliding water". The factor "outflow and penetration after melting" hardly happens.