Synthetic biology has brought new challenges to both biosafety and biosecurity， which has influenced man’s common life health and life safety. Solidarity， a new ethical principle of science and technology ethical governance， has been endowed with important normative significance in guiding synthetic biology towards goodness and solving its safety problems in ethical governance. Under the principle of solidarity， synthetic biology should give its priority to safeguarding public interest and helping vulnerable groups， promote dialogue and cooperation at all levels， join hands with all parties to address potential biosafety and biosecurity issues， and commit to its good， safe and sustainable development， so as to achieve the purpose of benefiting mankind.