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This question already has an answer here:

Is it possible to block a double-check, or is your only option to move the king? (I'm trying to code a chess game, to then go on to code a chess AI, and this would really help me)

marked as duplicate by Rewan Demontay, Brian Towers Aug 3 at 19:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Moving the king is the only way to escape a double check. There is no possible other move that will block both checks.

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