Type 639 underwater sound measurement ship
| Type | Pennant # | Builder | Fleet | Launched | Commissioned | Notes |
| 639 | Bei-Diao 991 | Wuchang Shipyard | North Sea Fleet | After 2000 | 2009 | 2019 : Active |
| 639A | Bei-Ce 901 | Wuchang Shipyard | North Sea Fleet | After 2000 | 2015 | 2019 : Active |
| 639A | Dong-Ce 232 | Wuchang Shipyard | East Sea Fleet | After 2000 | 2013 | 2019 : Active |
| 639A | Dong-Ce 233 | Wuchang Shipyard | East Sea Fleet | After 2000 | 2015 | 2019 : Active |
| 639A | Nan-Ce 429 | Wuchang Shipyard | South Sea Fleet | After 2000 | 2013 | 2019 : Active |
| 639A | Nan-Ce 430 | Wuchang Shipyard | South Sea Fleet | After 2000 | 2013 | 2019 : Active |
| Displacement, full | 1,500 tons |
| Displacement, light | tons |
| GT (Gross Tonnage) | tons |
| NT (Net Tonnage) | tons |
| DWT (Deadweight) | tons |
| Length, O/A | meters / feet |
| Length, W/L | meters / feet |
| Length, B/P | meters / feet |
| Max Beam | meters / feet |
| Draft | meters / feet |
| Height | meters / feet |
| Propulsion Type | |
| Engines | |
| Number of Main Engine(s) | |
| Main Engine builder | |
| Main Model | |
| Main RPM | |
| Main power | |
| Propeller(s) | |
| Speed, maximum | knots |
| Speed, Cruise | Knots |
| Range | nautical miles at knots |
| Stores endurance | days |
| Electronics | |
| Weapons Systems | |
| Aviation | |
| Complement |
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