In the UK it is traditional although not mandatory for a wife to take the family name of her husband. In the case of a Chinese wife of course there is the added complication of her name being the "wrong way around" (family name > Given name). The question is what decision did you make? The options could be;
Keep the Chinese name as is. (could cause confusion with forms etc)
Change the order (Chinese given name> Chinese family name)
Use husbands family name and Chinese given name
Use husbands family name and Chinese given name plus Chinese family name. (like double barreled family name or middle name)
If the name is changed is there any legal formality required ?