The demand on large-sized engineering tires is expanding with a increasinguse of heavy-duty trucks in China's large-scaled open pit mines,In order to accommodatethis situation,concerned department of the national government sponsored a national re-search programme large-sized tires,with a satisfied the author had been in charge of andtook part in the program using the actual information and data,the author described theachievements of the program,and compared the average running mileage of the developedtires with that of imported tires under equal conditions.The result have shown that manyvalidly tested tires had longer average running mileage than the imported tire.And a greatdeal of economic benefits have been obtained.