Abstract: Structure and performance of single and double armored flexible transition submarine cable were analyzed and tested in the paper. Firstly, electrical properties and mechanical properties of the two kinds of armored structures were compared, and applicability of the two kinds of armored structures in different marine environments (such as shallow sea, deep sea and complex seabed terrain) was studied. Then, trial production for single and double armored flexible transition submarine cable was carried out, and electrical properties and mechanical properties were tested according to relevant standards. Experimental results showed that electrical properties and mechanical properties of single and double armored flexible transition structure fully met the requirements of target environmental conditions. Changing submarine cable armor from single to double in partial laying environment could ensure that single and double armored flexible transition cable showed better mechanical protection and durability under high pressure in deep sea, strong ocean current and external impact environment, and the cost was lower than double armor. The research could provide theoretical basis and experimental support for the selection of submarine cable armored structure, and offer important guiding significance for practical engineering application of submarine cable.