Abstract: The multiply module adaptive nulling antenna were applied widely in the GPS system in recent years, which weakened the jamming efficiency of single GPS interference station. The method of how to improve the interference efficiency became a hot issue. The failure mechanism of multiply module receiver based on threshold ratio of interference signal was analyzed at the beginning, and then the jamming countermeasure efficiency of the multiply module receiver to a single satiation jamming was tested. The high-power broadband jamming jointed mode was building at last, and the interference efficiency was researched by mathematic simulations, which multiply stations with broadband high-power suppression model jammed the receiver which applied the 4 element antenna using the minimum linear constraint equation algorithm (LCMV) adaptive null algorithm. The results indicated that the interference efficiency of the multiply module GPS system was improved effectively by the multiply stations using high-power broadband jamming models with properly arrangement.