In place of cash and current deposit, the issuance and circulation of electronic currency will result in seigniorage decrease no matter how to define seigniorage. Different types of virtual currency have different influence on seigniorage. TypeⅠhas no influence on seigniorage of central bank；typeⅡcuts seigniorage；the influence of typeⅢand Ⅳdepends on the degree of decrease effect and increase effect of its demand for real currency. If the cash in circulation was completely replaced by electronic currency and virtual currency, the G10 would lose 34.59% （the data of the year 2001）of seigniorage on average, and China would lose 31.67% （the data of the year 2013） of seigniorage, but the losing seigniorage is small portion of GDP. Electronic currency and virtual currency are the future forms of currency development, and any measures banning them are unwise, but measures（for example, Reserve Fund System of electronic currency and virtual currency issuance）should be taken to alleviate the replace of cash and current deposit by electronic currency and virtual currency so as to minimize the impact on seigniorage and financial policy by electronic currency and virtual currency.