The Ti-30Zr-5Al-3V (TZ30) alloy, having a low elastic modulus close to biological bones, promises great application potential for implant biomaterials. Surface performance of an implant plays a key role in tissue growth and long-life safe service. The surface micro/nanostructure on the TZ30 alloy is prepared and adjusted by using the electrochemical etching (ECE) method. Effects of main parameters (current density, electrolyte concentration, and etching time) of the ECE method on surface morphology are investigated. The size of all etch pits after ECE treatment is on the micrometer scale. Current density most influences the average pit diameter. Electrolyte concentration (NaBr in this work) is the dominant factor in pit depth. The size of etch pits is from 4.7 to 97.4 μm for diameter and from 3.6 to 27.8 μm for depth. A nearly “ideal” surface is obtained after ECE treatment at 0.5 mol/L NaBr, 300 mA/cm2, and lasting for 3 min. The etching structure inside pits is on a micro/nano-scale. Decreasing electrolyte concentration and extending etching time help to form the tiny and uniform micro/nanostructure. The minimum size of the equiaxed structure inside pits is approximately 0.27 μm. It would help to promote applications of Ti alloys as hard tissue implants. [ABSTRACT FROM AUTHOR]