In testing a flying object in the range,the detecting, tracking and estimating of the position of the object are necessary.After analyzing laser tracking and measurement system and infrared search and tracking system’s the development now, work principle and development trend, a new data fusion model based on LTMS and IRST was put forward. The fusion model can be used to make data fusion during the flying object test in the range in order to obtain the more precise data about the flying object position.