Abstract: The relative attitude of the return cabin and parachute is an important factor for the landing of the return cabin, and is an important basis for designing and improving the space vehicle. since the size limitation of the return cabin,the measurement accuracy of traditional multi-view intersection method could not satisfy the need of the project. A new method, collinear restrict method, is proposed for solving the problem. With the new method, the camera on the top of return cabin acquires the images of the parachute, and then adds the restrain information for acquiring the relative attitude. The simulation results show that the new mathod has great capability in accuracy and antijamming.