parsing json failure with japanese characters in json string with coldfusion

In a cfm file,I get a string from a http request,but the string has japanese characters,I want to translate the json string to array using DeserializeJSON() funciton, but it appears error "JSON parsing failure: Expected ',' or '}' at character 844:'c'". and I found the japanese characters become messy code and the character 844 is the first japanese character. Is there anyone have a solution for it? really need your help!