Abstract: Value symbiosis and reason alignment are two bottom-up ethical design ideas for artificial intelligence, but they can’t replace top-down ethical design. To regulate the overall ethical design of AI, it is necessary to establish meta-value norms in value alignment. This meta-value norm can be summarized as follows: taking the universalizability of human-computer symbiosis as the criterion, under this abstract criterion, any specific value goals and behavioral methods are limited and incomplete, and therefore require reflection and modification. However, if the goals and behaviors are to be modified, the fullest possible reasons must be given. From this, value symbiosis and reason alignment can be integrated into the larger framework of value alignment, and AI ethical design achieves a higher level of synthesis.