Abstract: In this study an innovative peg-nail structured laser modification was carried out double-ceramic-layer thermal barrier coating (DCL-TBCs) by a pulsed Nd:YAG laser which were fabricated by a NiCoCrAlYTa bond coat and two ceramic top coat (YSZ and La₂Ce₂O₇, LC) sprayed by air plasma spraying. Results indicate that the roughness of the laser modified surface has significantly improved, compared with as-sprayed coatings. The completely recrystallization can be found in the peg-nail structured laser modified unit, including a fully dense columnar microstructure. Due to the peg-nail structured laser modification which generated re-melting and resolidificating at the whole LC coat and partial YSZ coat, can greatly improve the interface bonding property and the bonding strength, the peg-nail structured laser modified samples have better spallation or delamination resistance than the normal as-sprayed DCL-TBCs.