The altitude controlling for aerial tow target of flight at lower-altitude can not adopt orientation-control by reason of moderate cost. This paper considers the problem of invariableness altitude flight for aerial tow target by one-dimensional altitude control (non-orientation-control). The aerial tow target for invariableness altitude flight is provided with higher-stability, and it has elevators that is used to produce motion up or down by approximately derect lift. In this paper, it is described dynamically modeling and automatically controlling the motion of invariableness altitude flight. The aerodynamics characteristic of aerial tow target is analyzed, and some typical results in a digital computer simulation are provided. The results show that the aerial tow target system can control flight altitude and achieve invariableness altitude flight.