In order to improve the technology implementation efficiency during ship welding test, a software of ship welding expert database based on MySQL and Back Propagation (BP) neural network is developed. The software is composed of expert database, report form generator, heat input value predictor, human machine interface, and communication interface. The welding expert database is developed based on MySQL, and the heat input value predictor is designed based on BP neural network. The software possesses the automatic functions such as automatic groove figure generation, automatic Welding Procedure Specification (WPS) generation, and automatic expert experience data access, etc., and possesses the intelligent heat input value prediction and other intelligent functions. The results of actual ship welding test show that the software can meet the requirements of actual ship welding test, access the expert experience data quickly, and improve the efficiency of welding test process.