The best time for trigger finger surgery is when interlocking phenomenon occurs, and after interlocking, the finger is flexed and extended with force, and when the tendon expanding nodule is forced to squeeze through the narrow tendon sheath, trigger-like movement and popping sound occurs, and at this time, surgical treatment can be chosen. The surgical method is as follows: local infiltration anesthesia, make a transverse incision of about 1.5 cm or L-shaped incision at about 2-3 cm next to the nodule, reveal and peel off the tendon sheath ligament of the finger to avoid damaging the nerve and blood vessel bundles of the finger, locate the nodule, make a longitudinal incision of the finger tendon sheath ligament for 2 cm, cut off the hypertrophic and narrow tendon sheath, loosen the adhesion around the flexor tendon of the finger and recover the normal sliding of the tendon.