What to do if spouse is missing for years?

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Civil Code, Part IV, Chapter II, Section 5:

@Art. 1052

Where either the husband or the wife meets one of the following conditions, the other party may petition the court for a juridical decree of divorce:
(1) Where he or she has committed bigamy;
(2) Where he or she has consensual sexual intercourse with another person;
(3) Where he or she abuses the other party as to render common living intolerable;
(4) Where he or she abuses the lineal relative of the other party, or his or her lineal relative abuses the other party as to render common living intolerable;
(5) Where the other party has deserted him or her in bad faith and such desertion still continues;
(6) Where he or she is intent on murdering the other party;
(7) Where he or she has a loathsome disease which is incurable;
(8) Where he or she has a serious mental disease which is incurable;
(9) Where it has been uncertain for over three years whether he or she is alive or dead; or
(10) Where he or she has been sentenced to more than six months imprisonment for an intentional crime.

Either the husband or the wife may petition for a juridical decree of divorce upon the occurrence of any gross event other than that set forth in the preceding paragraph that renders it difficult to maintain the marriage, except if either the husband or the wife is responsible for the event, only the other party may petition for the divorce.

You can have a free (brief) consultation at the Legal Aid Foundation: http://www.laf.org.tw. Ask for an English speaker if you’re not fluent in Mandarin (but don’t expect fluent English anyway).

This service is also available at Taipei City Hall (ground floor). They don’t claim to have service in English there, but it’s also free.