Abstract: Explosive welding window is an important method to obtain good bonding quality. The theoretical model and parameter selection of calculation are very important to the results. Starting from the parameters of explosive welding, by analyzing the development process, theoretical assumptions and parameter selection of the window boundary formula of explosive welding, a convenient window calculation formula is obtained. The formula is applied to titanium/aluminum welding, the welding methods of titanium and different grades of aluminum alloy are analyzed, and the quality of welding interface under different charge ratio is predicted. With the increase of aluminum alloy hardness, the welding window decreases gradually. When the welding parameters are located in the middle of the window, the interface is wavelet and the bonding quality is good; When the welding parameters are close to the upper limit of the window, the interface is large wave and there are a lot of micro defects. The results show that welding window is an important research means and can better guide production practice.