还是有效的，使用时要新旧护照一起用。加拿大移民局官网的解释如下：The multiple-entry visa can still be valid but affixed in an expired travel document (in this case, the holder must also be in possession of a newer and valid travel document and must present both travel documents to the airline carrier in order to travel to Canada and to the border services officer in order to seek entry into Canada). 译文：贴在已过期旅行证件里的多次签证可以依然有效（在这种情况下，证件持有人必须也持有新的有效旅行证件，登机以及入境加拿大时必须同时出示新旧证件）。
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