The ZSD90 (also known as Type 90) is the armoured personnel carrier (APC) developed from the ZSD89 (Type 89). The ZSD90 shares that same hull design with the ZSD89 but has the 12.7mm anti-aircraft machine gun replaced by a one-turret. As a result of this modification, the combat weight of the vehicle was increased to 15.4 tonnes.
The main armament includes an automatic 25mm cannon, which has a full 360° traverse with an elevation of -8° ~ 55°. Ammunition load for the cannon is 400 rounds, with an additional 120 HE (high-explosive) rounds and 80 AP (Armour-Piercing) rounds carried in the turret. The 25mm gun can fire single, 3-round burst, or 5-round burst. The max rate of fire is 100r/min or 200r/min. The secondary weapon us a 7.62mm coaxial machine gun. The smoke grenade launchers are mounted on the turret.
A small number of the ZSD90 were built for test and evaluation, but the vehicle did not enter the PLA service.
