Traditional motorselectionwillleave moremargin, resulting in thesizeof servodrive motoris too large, and then lead to the size and quality of the whole system increase. Therefore, the platform should be fully considered when selectingthe motor. Inthispaper, the factorsshould beconsidered when servo controlmotorofa photoelectric equipment overcomes the external environment are analyzed, such as in complex sea conditions under the carrier sway, and the appropriate motor is selected according to the mechanical performance index of the motor. The rationality of the motor selectionisverifiedbytheswingtestandpracticalapplication.