Impingement angle and wall curvature are important for liquid film cooling design of liquid rocket engine. The effect of impingement angle and wall curvature on film form and thickness was studied experimentally. The film thickness was calculated by contact needle method. Splash occurred with high Webber number during impingement. The critical Webber number for transformation from adherent to splash is 214.1, and the critical impingement angle is 23.1°, which means the impingement angle can be optimized for different liquid rocket engines.