<p>Additive manufacturing technology has rapidly developed to enable the manufacturing of various complex feature parts. However, parts manufactured through laser metal deposition (LMD) often exhibit poor surface quality with the waviness of significant peak-to-valley distance, making it hard to improve surface quality through laser polishing. This study proposes a surface treatment method using ultrafast laser asynchronous processing to solve the issue of large waviness in Ti6Al4V parts manufactured by LMD, in which rough processing is carried out using a picosecond laser with a f-theta lens and finishing processing is conducted using a femtosecond laser with an objective lens. The influence of laser energy, defocusing distance, and repetition times on material surface quality is investigated. Through parameter optimization, the peak-to-valley distance on the material surface can be reduced from the initial 250 to about 8&#xa0;µm, resulting in a relatively flat material surface, which verifies the effectiveness of the asynchronous processing strategy of the ultrafast laser.</p>